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Closeup of cinnamon crumb coffee cake on a white plate.

High Altitude Cinnamon Crumb Coffee Cake

Heather Smoke
This buttery cinnamon crumb coffee cake has loads of crunchy streusel on top of a moist sour cream coffee cake.

All recipes on Curly Girl Kitchen are developed for high altitude at 5,280 feet. See FAQs for adjusting to higher or lower elevations.

4.84 from 6 votes
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Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Course Breakfast
Cuisine American
Servings9

Ingredients
 

Cake

  • 5 tbsp unsalted butter, melted
  • ⅓ cup dark brown sugar, lightly packed
  • 2 large eggs
  • 2 tsp vanilla extract
  • 1 cup sour cream
  • 1 ⅓ cups all-purpose flour, spooned and leveled
  • 1 ½ tsp baking powder
  • ¼ tsp baking soda
  • ¼ tsp coarse Kosher salt (if using table salt, use half the amount)
  • 1 ¼ tsp ground cinnamon
  • ½ tsp ground nutmeg

Crumb Topping

  • ⅓ cup granulated sugar
  • ⅓ cup dark brown sugar, lightly packed
  • 1 ½ cups all-purpose flour, spooned and leveled
  • ¼ tsp ground nutmeg
  • 1 tsp ground cinnamon
  • ¼ tsp coarse Kosher salt (if using table salt, use half the amount)
  • ½ cup unsalted butter, melted

Instructions
 

Cake

  • Preheat the oven to 350 F, and spray a 9x9 inch baking pan with non-stick spray.
  • In a large mixing bowl, whisk together the melted butter, brown sugar, eggs, vanilla and sour cream.
  • Separately, sift together the flour, baking powder, baking soda, salt, cinnamon and nutmeg. Add the dry ingredients to the wet, and stir together with a spatula, just until moistened. The batter will be thick.
  • Spread the cake batter evenly into the prepared pan.

Topping

  • In a bowl, combine the sugar, brown sugar, flour, nutmeg, cinnamon and salt. Drizzle with the melted butter and toss together with a fork until moistened and crumbly. Sprinkle over the cake batter.
  • Bake the cake on the center oven rack for about 22-30 minutes, until a toothpick or cake tester inserted in the center comes out clean.
  • Cool for 10-15 minutes, and serve warm.

Notes

  • Leftover coffee cake should be stored in an airtight container for up to 5 days.
  • Make this cake ahead by baking it the night before!  Warm up pieces by microwaving for 15-20 seconds on 50% power for a just-baked texture.
Keyword Cinnamon, Coffee Cake, Crumb Cake, High Altitude
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