Name: Irish Apple Cake with Custard and Streusel Topping Recipe
Prep time: 25 min
Cook time: 1 h
Total time: 1 h 25 min
Cuisine: Irish
Ingredients: 1/2 cup unsalted butter, at room temperature; 1/2 cup granulated sugar; 2 large eggs; 3 Tbsp whole milk or cream; 1 1/4 cups all-purpose flour; 1 tsp baking powder; 1 tsp cinnamon; 1/8 tsp salt; About 3 Granny Smith apples (a little over 1 pound after peeling and slicing), peeled and thinly sliced; 3/4 cup all-purpose flour; 1/4 cup old fashioned rolled oats; 6 Tbsp unsalted cold butter, cut into small pieces; 1/2 cup granulated sugar; 6 large egg yolks; 6 Tbsp granulated sugar; 1 1/2 cups whole milk (or half and half, or cream); 1 1/2 tsp vanilla extract; Confectioner's sugar, for dusting

I absolutely adore sharing this Irish Apple Cake with Custard and Streusel Topping Recipe because it feels like a warm hug from an Irish grandmother herself. The tender, cinnamon-spiced cake layered with tart apples, topped with a buttery crumbly streusel, and served alongside a luxuriously smooth custard is just pure comfort on a plate. Every single bite bursts with cozy flavors that remind me of homey gatherings and special moments. If you love apple desserts, this cake will quickly become a beloved staple in your baking repertoire.

Why You'll Love This Irish Apple Cake with Custard and Streusel Topping Recipe

What makes this recipe stand out to me is that perfect harmony between the soft, spiced cake, tart-sweet apple slices, and that irresistible crumbly streusel topping. The cinnamon in the batter adds just the right hint of warming spice, while the apples bring a fresh acidity that balances everything beautifully. I also love how the custard offers a silky, indulgent contrast that really elevates the whole dessert experience.

This recipe is surprisingly easy to pull together, too. Although there are multiple components—the cake, streusel, and custard—they each come together with straightforward techniques that even beginner bakers can manage. The step-by-step process is very satisfying for me, especially knowing how delicious the end result will be. Plus, it’s a crowd-pleaser I’m proud to bring out for various occasions, from festive holiday dinners to relaxed family gatherings on a Sunday afternoon.

If you’re looking for a dessert that is both nostalgic and a little bit special, yet doesn’t involve complicated or hard-to-find ingredients, this Irish Apple Cake with Custard and Streusel Topping Recipe is an absolute winner. It feels like a cozy moment captured in a dessert, and that’s why I keep coming back to it whenever I crave something sweet and comforting.

Ingredients You'll Need

The image shows a green apple cut into two halves placed on a light wood cutting board. The apple’s skin is bright green, with a smooth texture. The inside of the apple is pale white with visible seeds in the center. The two halves are arranged side by side, with one half slightly in front of the other. Next to the apple halves, there is a small knife with a shiny silver blade and a dark wooden handle resting on the cutting board. The background has a soft focus on the wooden surface. photo taken with an iphone --ar 4:5 --v 7

The beauty of this recipe lies in its simplicity and how each ingredient plays a crucial role in flavor, texture, and appearance. From the tender butter and warming cinnamon in the batter to the crisp apples that add freshness, every component is thoughtfully chosen to create a balanced and satisfying dessert.

TIP : You'll find the full list of ingredients and measurements in the recipe card below

Unsalted butter: Using room temperature butter in the cake and cold butter in the streusel helps create perfect textures for each.
Granulated sugar: Sweetens the cake and streusel while allowing the butter to cream nicely for lightness.
Large eggs: Provide structure and richness to the cake batter.
Whole milk or cream: Adds moisture and tenderness to the cake crumb.
All purpose flour: Forms the base of both the cake and the streusel topping for the right bite.
Baking powder: Gives the cake lift and lightness.
Cinnamon: Adds warm, aromatic spice that complements the apples beautifully.
Salt: Enhances all the flavors and balances the sweetness.
Granny Smith apples: Their tartness and firm texture keep the cake fresh and vibrant.
Confectioner's sugar: A dusting on top for a pretty, sweet finish.
Old fashioned rolled oats: Adds a wonderful rustic crunch to the streusel topping.
Egg yolks and vanilla: The stars of the custard, enriching it with creaminess and a lovely aromatic note.

Directions

Step 1: Preheat your oven to 350°F and grease a 9-inch springform pan thoroughly. This will ensure your cake comes out easily without sticking.

Step 2: It’s best to prepare the custard ahead of time. In a medium saucepan, bring the milk to a gentle simmer over medium heat. Meanwhile, whisk the egg yolks and sugar together until smooth and pale.

Step 3: Slowly drizzle a small amount of the hot milk into the egg yolk mixture while whisking constantly to temper the eggs. Add a little more milk the same way, then pour everything back into the saucepan with the remaining milk.

Step 4: Cook the custard over medium heat, stirring continuously with a silicone spatula, scraping the bottom and sides to prevent curdling. Cook until it thickens enough to coat the back of a spoon—this should take several minutes. Remove from heat and stir in vanilla.

Step 5: Pour the custard through a fine sieve into a heatproof container to remove any lumps. Cover closely with plastic wrap touching the surface to prevent a skin from forming, then refrigerate until completely chilled.

Step 6: Next, make the streusel topping by combining the flour, rolled oats, sugar, and cold, small butter pieces. Rub the butter into the dry ingredients until the mixture resembles coarse crumbs. Chill this while you prepare the cake batter.

Step 7: Cream together the softened butter and sugar until light, fluffy, and pale in color. Beat in the eggs one at a time, making sure each is fully incorporated before adding the next.

Step 8: In a separate bowl, whisk together the flour, baking powder, cinnamon, and salt. Fold these dry ingredients gently into the butter mixture, then add the milk or cream and mix until combined.

Step 9: Spoon the batter evenly into your prepared pan and smooth the surface. Arrange the thinly sliced apples evenly on top—not meticulously, but covering the surface well.

Step 10: Sprinkle the chilled streusel topping generously over the apples in an even layer.

Step 11: Bake in the preheated oven for 50 to 60 minutes until the streusel is golden brown and a toothpick inserted near the center comes out clean or with just a few moist crumbs.

Step 12: Allow the cake to cool slightly in the pan before removing the ring, then dust with confectioner's sugar just before serving for that classic finishing touch.

Servings and Timing

This Irish Apple Cake with Custard and Streusel Topping Recipe yields about 10 generous servings, making it perfect for family gatherings or small parties. The entire prep time is roughly 25 minutes, though a portion of that goes to making the custard sauce which you can prepare ahead of time. Baking takes about 50 to 60 minutes, so all in all, you’re looking at approximately 1 hour and 35 minutes total including cooling time. Since the custard needs to chill thoroughly, it’s best to plan ahead or make it the day before. The resting before serving is just a few minutes to let everything settle perfectly.

How to Serve This Irish Apple Cake with Custard and Streusel Topping Recipe

A round crumble cake with one layer, light golden brown with a crumbly, coarse texture covering the top, placed on a wire rack over a white marbled surface. Behind the cake are two whole bright green apples. On the right side, there is a small clear glass jar filled with pale yellow sauce and a silver spoon inside. A silver cake server and a knife with a wooden handle rest on a light beige cloth next to the jar. Photo taken with an iphone --ar 4:5 --v 7

I love serving this cake warm or at room temperature because it allows the flavors to really shine. The custard should be chilled but pourable, and I like to drizzle it generously over each slice to complement that tender apple-filled cake. For presentation, a simple dusting of confectioner's sugar adds a lovely snow-like finish that feels festive yet natural.

For a little extra flair, I sometimes garnish with a sprig of fresh mint or a few thin apple slices fanned elegantly on the plate. It’s a simple touch that instantly makes the dessert feel special. If you’re serving this for a family dinner or holiday, pairing it with a lightly sweetened tea or a glass of cold milk feels just right. For an adult twist, a crisp white wine like a Riesling or a smooth Irish cream liqueur on the side can be delightful companions.

This dessert is incredibly versatile: perfect for cozy weekend brunches, afternoon teas with friends, or as a comforting finale to a lively dinner. I recommend serving moderate portions because the cake is rich and filling, but it’s so good, people often want second helpings!

Variations

Over the years, I’ve experimented with a few variations on this Irish Apple Cake with Custard and Streusel Topping Recipe to suit different tastes and dietary needs. For a gluten-free alternative, swapping the all-purpose flour for a gluten-free blend works well, just be sure to check the ratios and perhaps add a teaspoon of xanthan gum for structure.

If you’re vegan or avoiding dairy, replacing the butter with a plant-based margarine and using a non-dairy milk such as oat or almond milk for both the cake and custard can still deliver a tasty result. You can substitute flax eggs (ground flaxseed mixed with water) instead of chicken eggs to keep things egg-free. The custard can be adapted by using a cornstarch-thickened plant milk base combined with silken tofu or coconut cream for richness.

Flavor-wise, I love adding a handful of chopped walnuts or pecans to the streusel for added crunch and a nutty dimension. You can also swap the Granny Smith apples for Braeburn or Honeycrisp if you want a sweeter, less tart flavor. Some friends also enjoy adding a splash of Irish whiskey or a few dried currants to the batter for a boozy, textural twist. Baking it in different sized pans or even muffin tins can be fun, turning this cake into portable treats for picnics or parties.

Storage and Reheating

Storing Leftovers

When I have leftovers, I store the cake in an airtight container at room temperature for up to two days. If it has been refrigerated after serving with custard, I recommend keeping it covered well to prevent it from drying out—about 3 to 4 days is ideal. Using a springform pan or cake saver lid that seals well works great for maintaining freshness.

Freezing

This apple cake freezes beautifully, though I suggest freezing it without the custard since custards generally don’t freeze well. Wrap the cooled cake tightly in plastic wrap and then in aluminum foil to prevent freezer burn. It will keep in the freezer for up to 2 months. When you’re ready to enjoy, thaw overnight in the fridge to retain moisture and texture.

Reheating

To bring your leftover cake back to life, I find reheating in a warm oven (about 300°F) for 10 to 15 minutes works wonders. This lightly warms the cake without drying it out. Microwave reheating can result in a soggier texture, so I avoid that whenever possible. Always add your chilled custard fresh just before serving for best flavor and consistency.

FAQs

Can I use other types of apples for this recipe?

Absolutely! Granny Smith apples are recommended for their tartness and firmness, but you can substitute with Braeburn, Honeycrisp, or even Fuji apples. Just keep in mind that sweeter apples will make the cake milder in flavor, and softer apples may break down more during baking.

Is it possible to make the custard ahead of time?

Yes, the custard is best made ahead and chilled completely before serving. It thickens as it cools and the flavors develop more depth. Just be sure to cover it with plastic wrap placed directly on the surface to prevent a skin from forming.

Can I prepare the streusel topping the day before?

Definitely! The streusel topping can be made a day in advance and stored in the refrigerator. This actually makes it easier to sprinkle over the cake just before baking, and keeps the butter cold, ensuring a perfect crumbly texture.

How do I know when the cake is fully baked?

The cake is done when the streusel topping is golden brown and a toothpick inserted into the center comes out clean or with just a few moist crumbs. If the toothpick shows wet batter, bake for another 5 to 10 minutes and check again.

Can I make this cake in a different pan size?

Yes, but keep in mind that cooking times will vary. If you use a smaller pan, the cake will be thicker and take longer to bake, while a larger pan yields a thinner cake that will bake faster. Adjust baking times accordingly and check doneness with a toothpick.

Conclusion

I truly hope you give this Irish Apple Cake with Custard and Streusel Topping Recipe a try soon. It’s one of those desserts that feels like a celebration of simple ingredients turning into something extraordinary. Whether for a cozy night in or a special gathering, this cake never fails to impress and comfort me at the same time. Happy baking, and enjoy every delicious bite!