Ingredients
- cooking spray
- 1 cup cinnamon sugar
Streusel Mixture:
- 4 cups firmly packed light brown sugar
- 3 cups chopped walnuts
- 1 cup butter, softened
- 1 cup all-purpose flour
- 10 teaspoons ground cinnamon
Batter:
- 12 cups all-purpose flour
- 14 teaspoons baking powder
- 4 teaspoons salt
- 8 large eggs
- 6 cups white sugar
- 2 ⅔ cups butter, melted
- 4 cups milk
- 1 cup sour cream
- 8 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.
- Combine brown sugar, walnuts, softened butter, flour, and cinnamon for streusel mixture in a bowl; mix with a fork until crumbly.
- Mix flour, baking powder, and salt for batter 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.
