American Flag Cake Recipe: How to Make It

Ingredients

• 1 package French vanilla cake mix (regular size)
• 1 cup buttermilk
• 1/3 cup canola oil
• 4 large eggs
• FILLING:
• 1 package (3 ounces) berry blue gelatin
• 1-1/2 cups boiling water, divided
• 1 cup cold water, divided
• Ice cubes
• 1 package (3 ounces) strawberry gelatin
• 2/3 cup finely chopped fresh strawberries
• 1/4 cup fresh blueberries
• FROSTING:
• 3/4 cup butter, softened
• 2 cups confectioners' sugar
• 1 tablespoon 2% milk
• 1 jar (7 ounces) marshmallow creme