- 1/2 cup butter
- 1/2 cup vegetable oil
- 1 1/4 cups white sugar
- 2 eggs
- 2 cups grated zucchini
- 1/2 cup buttermilk
- 2 1/2 cups all-purpose flour
- 1/4 cup unsweetened cocoa powder
- 1 teaspoon baking powder
- 1 teaspoon salt
- 1 (8 ounce) package cream cheese, softened
- 2 tablespoons butter, softened
- 1/4 cup white sugar
- 1 tablespoon cornstarch
- 1 egg
- 2 tablespoons milk
- 1/2 teaspoon vanilla extract
- Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9×13 inch pan. Sift together the flour, cocoa, baking powder and salt. Set aside.
- In a large bowl, cream together 1/2 cup butter, oil, and 1 1/4 sugar until light and fluffy. Beat in 2 eggs, one at a time, then stir in the zucchini. Beat in the flour mixture alternately with the buttermilk. Pour half of the batter into prepared pan.
- Make the filling: In a medium bowl, beat cream cheese, 2 tablespoons butter. Combine 1/4 cup sugar and cornstarch; beat into the cream cheese mixture until smooth. Beat in 1 egg, milk and vanilla. Pour over batter in pan, distributing evenly. Pour remaining batter over filing.
- Bake in the preheated oven for 50 to 60 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool.