Servings: 15 servings.
1 package French vanilla cake mix (regular size) 1 cup buttermilk 1/3 cup canola oil 4 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
