Berry Ice Cream Cake

Name: Berry Ice Cream Cake
Ingredients: Basic Chocolate Cake, recipe follows, baked and cooled; 3 cups strawberry ice cream, softened; 2 1/2 cups raspberries and/or quartered strawberries; 1/4 cup sugar; 3/4 cup cold heavy cream; 1 teaspoon vanilla extract; Cooking spray; 1 cup unsweetened cocoa powder (natural or Dutch process); 2 1/2 cups all-purpose flour; 2 cups sugar; 1 1/2 teaspoons baking powder; 1 teaspoon baking soda; 1 teaspoon salt; 3 large eggs, at room temperature; 3/4 cup vegetable oil; 1/2 cup sour cream; 2 teaspoons vanilla extract