Peek-A-Boo St. Patrick’s Day Cake

Name: Peek-A-Boo St. Patrick’s Day Cake
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 1 box white cake mix (prepared according to package instructions*); 1 box chocolate cake mix (prepared according to package instructions*); Food coloring of your choice (I used red, orange, yellow, green, blue); Sprinkles; *Note - keep the cake batters in 2 separate bowls. One will be colored, the other stays white; 1 cup unsalted butter, softened at room temperature (2 sticks); 3-4 cups powdered sugar; 1/4 cup heavy cream; 2 1/2 teaspoons vanilla extract (use clear vanilla flavoring for brighter color); Green food coloring