Perfect vanilla sheet cake topped with creamy chocolate buttercream frosting and your favorite colored sprinkles is perfect for any birthday or get-together.
Cake: Heat oven to 350°F. Spray a 13×9-inch cake pan with cooking spray; set aside.
In a large bowl combine your dry ingredients; flour, sugar, baking powder, and salt together. Add the eggs, oil, milk, and vanilla and mix with a mixer on medium speed for about 2-3 minutes or until smooth.
Pour the batter into the sprayed baking sheet. Place in center rack of oven and bake for 30-35 minutes or until the cake is lightly browned and toothpick comes out clear or when it springs back when pressed with a finger. Cool the cake on a wire rack while preparing the frosting.
Frosting: In a large bowl beat with mixer room temperature butter until lightly fluffy. Add the powdered sugar a little bit at a time and mix well. You will notice it will get fluffy and lighter in color. Add cocoa, half and half (or milk), and vanilla. Be sure to scrape down the sides of the bowl as you work. Turn mixer on medium high. Beat frosting until light, fluffy and of spreading consistency.
If you notice that the frosting is too thick, slowly add more milk or half and half, one tablespoon at a time, until it reaches the desired consistency.
Once cake is completely cooled, spread the frosting on top of the cake with a frosting spatula or the back of a spoon. Decorate with your favorite colored sprinkles.
Recipe Inspired by: The Kitchn