Apple Crumble Coffee Cake

Chef John's tempting apple crumb cake recipe 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

Gather all ingredients.

Step 2

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

Step 3

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 4

Preheat the oven to 350 degrees F (175 degrees C) with an rack in the center position. Generously butter a 9x12-inch baking dish with 2 teaspoons butter.

Step 5

Whisk flour, baking powder, baking soda, and ½ teaspoon sea salt together in a bowl; set dry ingredients aside.

Step 6

Combine walnuts, ⅓ cup brown sugar, ⅓ cup white sugar, 3 tablespoons melted butter, cinnamon, and ¼ teaspoon salt in a bowl until walnuts and sugars are thoroughly coated with butter; set crumble mixture aside.

Step 7

Beat 1 cup white sugar and ½ cup butter together in a separate bowl with a spatula until well blended.

Step 8

Whisk in 1 egg until mixture is smooth, 2 to 3 minutes.

Step 9

Add flour mixture to yogurt mixture; whisk just until flour disappears. Do not overmix.

Step 10

Remove and discard cores from apples. Cut apples into ⅛- to ¼-inch slices. Stack a few slices; cut down the center, lengthwise, then dice, crosswise, into cubes.

Step 11

Fold apples into cake batter with a spatula until just combined.

Step 12

Spread ½ the batter into the prepared baking dish; evenly scatter ½ crumble mixture over top.

Step 13

Dollop remaining ½ batter on top crumble mixture; spread carefully to evenly distribute, trying not to disturb the crumbs.

Step 14

Top with remaining ½ crumble mixture; press crumbs into the batter very gently.

Step 15

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