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Crumb Cake
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4.88 from 8 votes

Crumb Cake

Sometimes crumb cakes lean towards dry - not so with this one! It is super moist from sour cream and tastes of brown sugar and cinnamon.
Prep Time15 mins
Cook Time1 hr 15 mins
Total Time1 hr 30 mins
Course: Dessert
Cuisine: American
Keyword: crumb cake
Servings: 12
Calories: 528kcal
Author: Stef


Cinnamon Sugar Ingredients

  • 1/2 cup granulated sugar
  • 1 tablespoon cinnamon

Cake Ingredients

  • 1 cup unsalted butter room temperature
  • 3/4 cup light brown sugar
  • 1/2 cup granulated sugar
  • 2 large eggs
  • 1 cup full-fat sour cream
  • 1/2 teaspoon vanilla extract
  • 2 cups all-purpose flour
  • 1 teaspoon baking powder
  • 1/8 teaspoon salt

Crumb Ingredients

  • 1/2 cup unsalted butter melted
  • 1 1/4 cups all-purpose flour
  • 6 tablespoons light brown sugar same as 1/4 cup + 2 tablespoons
  • 6 tablespoons rolled oats same as 1/4 cup + 2 tablespoons


Cinnamon Sugar Instructions

  • Mix ingredients in a small bowl and set aside.

Cake Instructions

  • Preheat oven to 350 F.
  • Beat butter, brown sugar, and white sugar in a medium-sized mixing bowl until light and fluffy.
  • Beat in eggs one at a time.
  • Beat in sour cream and vanilla.
  • In a separate medium-sized mixing bowl, whisk together flour, baking powder, and salt.
  • Add flour mixture to wet ingredients a little bit at a time until just combined.
  • Spread half of the batter into a greased 8" square cake pan.
  • Spread cinnamon sugar mixture evenly over the poured batter.
  • Top with the remaining batter.

Crumb and Baking Instructions

  • Mix all ingredients in a small bowl until large crumbs form.
  • Top the batter with the crumbs.
  • Bake for 75 minutes or until a toothpick inserted into the center of the cake comes out clean.
  • Optionally, sprinkle with a little more cinnamon and dust with powdered sugar.


You can substitute yogurt (plain or Greek) for the sour cream if that's what you have on hand.
Adapted from AllRecipes Sour Cream Coffee Cake III.


Calories: 528kcal | Carbohydrates: 65g | Protein: 6g | Fat: 28g | Saturated Fat: 17g | Cholesterol: 98mg | Sodium: 60mg | Potassium: 149mg | Fiber: 2g | Sugar: 37g | Vitamin A: 868IU | Vitamin C: 1mg | Calcium: 76mg | Iron: 2mg