Apple Crumble Coffee Cake

Chef John's tempting apple crumb cake has diced apples layered with a buttery cinnamon-walnut crumble for an elevated, irresistible coffee cake.

• Preparation Time: 25 mins
• Cooking Time: 40 mins
• Total Time: 1 hr 5 mins
• Calories: 631 Calories

Ingredients

• 2 cups all-purpose flour
• 1 cup white sugar
• 1 teaspoon baking powder
• 1 teaspoon ground cinnamon
• 2 large eggs
• 1 cup plain yogurt
• 3 tablespoons unsalted butter, melted
• 2 teaspoons unsalted butter
• 1.5 teaspoons vanilla extract
• 0.25 teaspoon salt
• 0.75 teaspoon baking soda
• 0.33333334326744 cup white sugar
• 0.5 cup unsalted butter, at room temperature
• 0.5 teaspoon fine sea salt
• 1.5 cups finely chopped toasted walnuts
• 0.33333334326744 cup packed light brown sugar
• 2 Honeycrisp apples

Recipe Instructions

Step 1

Preheat the oven to 350 degrees F (175 degrees C). Butter a 9x12-inch baking dish generously.

Step 2

Mix dry ingredients: Whisk flour, baking powder, baking soda, and salt together in a bowl. Set aside.

Step 3

Make the crumble: Combine walnuts, brown sugar, white sugar, melted butter, cinnamon, and salt in a bowl. Mix until walnuts and sugar are thoroughly coated with butter.

Step 4

Add dry flour mixture to wet ingredients; whisk just until flour disappears. Do not overmix.

Step 5

Gather all ingredients.

Step 6

Mix the wet ingredients: Cream sugar and butter together in another bowl with a spatula until well blended.

Step 7

Add 1 egg and whisk until mixture is smooth, 2 to 3 minutes.

Step 8

Whisk in second egg until thoroughly incorporated. Add yogurt and vanilla; whisk together.

Step 9

Remove cores from apples. Cut across into 1/8- to 1/4-inch slices. Stack up a few slices, make a cut down the center, and dice across into cubes.

Step 10

Add to cake batter, folding in with a spatula until just combined.

Step 11

Spread 1/2 of the batter evenly into the bottom of the prepared baking dish. Scatter 1/2 of the crumble mixture evenly over the top.

Step 12

Top with the rest of the batter in dollops. Spread carefully to evenly distribute, trying not to disturb the crumbs.

Step 13

Top with the rest of the crumb mixture. Press crumbs into the batter very gently.

Step 14

Bake in the center of the preheated oven until a toothpick or bamboo skewer inserted into the center comes out clean, about 40 minutes.

Step 15

Let cool to room temperature, about 30 minutes, before slicing and serving.