Ingredients

The following ingredients have 7 Servings
  • 1 package yellow cake mix ((mix only, not prepared))
  • 1 egg
  • 1 cup sour cream ((may sub plain greek yogurt))
  • ¼ cup butter (melted)
  • 1 teaspoon vanilla
  • 1 ¼ cups flour
  • ⅔ cup brown sugar
  • ½ cup sugar
  • ½ teaspoon salt
  • 1 teaspoon cinnamon
  • ½ cup butter (8 tablespoons) (chilled and cut into cubes)

Instruction

  • Preheat oven to 350 and grease a 9x13 inch baking dish with cooking spray.
  • First prepare the crumble. Whisk together flour, brown sugar, sugar, salt, and cinnamon. Cut in chilled butter until crumbly. Set aside.
  • Next prepare the cake. Combine cake mix, egg, sour cream, melted butter, and vanilla and mix until combined. It's okay if the batter still has some lumps.
  • Spread half the cake batter in the bottom of the greased baking dish (see note.) Sprinkle with half of the crumble mixture. Grease a rubber spatula and gently spread the remaining batter over the crumble (this takes a little finessing but it's worth it if you just work with it.) Top with remaining crumble.
  • Bake for 30-35 minutes until an inserted toothpick comes out clean. Serve warm.