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Finally, after all these years, I've come up with a solution for people who can't decide whether to make an apple crumble or coffee cake. This features the best things about both of those recipes. It's like baking a crumb-topped coffee cake on top of another coffee cake!

Recipe Summary

40 mins
30 mins
1 hr 35 mins
25 mins
1 9x12-inch cake


Original recipe yields 8 servings
The ingredient list now reflects the servings specified
Dry Ingredients:
Crumble Mixture:
Wet Ingredients:


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

  • Whisk flour, sea salt, baking powder, and baking soda together in a bowl. Set aside.

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

  • Cream butter and sugar together in another bowl with a spatula until well blended. Add 1 egg and whisk until mixture is smooth, 2 to 3 minutes. Whisk in second egg until thoroughly incorporated. Add vanilla extract and yogurt; whisk together. Add flour mixture to wet ingredients; whisk just until flour disappears. Do not overmix.

  • Remove cores from apples. Cut across into 1/8- to 1/4-inch slices. Stack up a few slices, make 1 cut down the center, and dice across into cubes. Add to cake batter, folding in with a spatula until just combined.

  • 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. Top with the rest of the batter in dollops. Spread carefully to evenly distribute, trying not to disturb the crumbs. Top with the rest of the crumb mixture. Press crumbs into the batter very gently.

  • Bake in the center of the preheated oven until a toothpick or bamboo skewer inserted into the center comes out clean, about 40 minutes. Let cool to room temperature, about 30 minutes, before slicing and serving.

Chef's Notes:

Dark brown sugar will work as well as light brown.

I used a relatively runny, but beautifully tangy, sheep's milk yogurt, but regular plain Greek yogurt will work, as well as sour cream.

You can use Honeycrisp or Granny Smith apples. If you cut your apples too big, your cake will be done but the apples will not be, so take your time and make them small.

Nutrition Facts

631 calories; protein 9.6g; carbohydrates 76g; fat 34.1g; cholesterol 95mg; sodium 434.9mg. Full Nutrition