Ingredients
Scale
For the Oatmeal Crumb Topping:
- 1/3 cup granulated sugar
- 1/3 cup brown sugar
- 1 cup cake flour
- 1/3 cup old-fashioned oats
- 1 teaspoon ground cinnamon
- 1/4 teaspoon nutmeg
- 1/4 teaspoon salt
- 8 tablespoons (1 stick) unsalted butter, melted
For the Cake:
- 1 1/4 cup cake flour
- 1/2 cup granulated sugar
- 1/4 teaspoon baking soda
- 1/4 teaspoon salt
- 6 tablespoons unsalted butter, room temperature
- 1 large egg
- 1 egg yolk
- 2 teaspoons vanilla extract
- 1/2 cup buttermilk, room temperature
For the Apples:
- 2 medium apples, peeled and thinly sliced
- 1/2 teaspoon cinnamon
- Pinch of nutmeg
- 1 tablespoon cornstarch
Instructions
- Prepare the crumb topping: In a bowl, I mix the sugars, cake flour, oats, cinnamon, nutmeg, and salt. Then I pour in the melted butter and stir until thick crumbs form. I set this aside while I make the cake.
- Start the cake: I preheat my oven to 325°F and spray an 8-inch or 9-inch square baking dish (or round springform pan) with baking spray.
- Make the cake batter: In my stand mixer bowl, I combine the flour, sugar, baking soda, and salt. Then I add the butter one tablespoon at a time until crumbs form. I add the egg and yolk, mix, and then add vanilla and buttermilk. I beat everything until it’s light and fluffy (about 1-2 minutes).
- Assemble the cake: I pour the cake batter into my prepared pan and spread it evenly. Then I toss the apple slices with cinnamon, nutmeg, and cornstarch, and layer them on top of the batter. Finally, I sprinkle the crumb mixture over everything, breaking larger pieces into smaller crumbs.
- Bake: I bake my Apple Crumb Coffee Cake for 35-45 minutes, until a cake tester comes out clean and the center barely jiggles.
- Cool: I let the cake cool in the pan for at least 30 minutes before slicing and serving.
Notes
- Make sure your butter and buttermilk are at room temperature for the best cake texture.
- I like to use Granny Smith or Honeycrisp apples because they hold their shape during baking.
- Don’t overmix the cake batter once you add the wet ingredients – this can make the cake tough.
- The cornstarch helps thicken any juice from the apples so your cake doesn’t get soggy.
- If the crumb topping starts to brown too quickly, loosely cover the cake with foil.
- Prep Time: 25 minutes
- Additional Time: 30 minutes
- Cook Time: 40 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 piece
- Calories: 320 kcal
- Sugar: 24g
- Sodium: 220mg
- Fat: 13g
- Unsaturated Fat: 8.9g
- Trans Fat: 0.3g
- Carbohydrates: 45g
- Fiber: 1g
- Protein: 3g
- Cholesterol: 35mg