Ingredients
- Cooking spray
- 1/4 cup cinnamon sugar
- Streusel Mixture:
- 1 cup firmly packed light brown sugar
- 3/4 cup chopped walnuts
- 1/4 cup butter, softened
- 1/4 cup all-purpose flour
- 2 1/2 teaspoons ground cinnamon
- Batter:
- 3 cups all-purpose flour
- 3 1/2 tablespoons baking powder
- 1 teaspoon salt
- 2 eggs
- 1 1/2 cups white sugar
- 2/3 cup butter, melted
- 1 cup milk
- 1/4 cup sour cream
- 2 teaspoons vanilla extract
Directions
Preheat oven to 375 degrees F (190 degrees C). Spray a 9×13-inch baking dish with cooking spray. Sprinkle cinnamon sugar into the bottom of prepared baking dish.
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Combine brown sugar, walnuts, softened butter, 1/4 cup flour, and cinnamon in a bowl using a fork until streusel is crumbly.
Mix 3 cups flour, baking powder, and salt together in a separate bowl. Beat eggs in a third bowl using an electric mixer until frothy; add white sugar and melted butter and beat until creamy. Add milk, sour cream, and vanilla extract and beat until smooth. Stir flour mixture into milk-butter mixture until batter is well blended.
Spread 1/2 of the batter into the prepared baking dish; top with 1/2 of the streusel mix. Spread remaining batter over streusel layer and top with remaining streusel.
Place dish on the center rack in the preheated oven; bake until a fork inserted in the center comes out clean, 15 to 20 minutes.