Fireworks Sugar Cookie Cake

INGREDIENTS

3/4 cup

unsalted Challenge Butter, softened

3/4 cup

granulated sugar

large egg

1 tbsp

vanilla extract

1/2 tsp

baking soda

1/2 tsp

salt

1/2 tsp

cream of tartar

2 cups

all purpose flour

1 cup

M&Ms (Use patriotic M&Ms for the 4th of July)

1/2 cup

“jimmie” sprinkles (use red and white for the 4th of July)

3 tbsp

unsalted butter, softened

1 1/2 cups

powdered sugar

1 tsp

vanilla extract

1/8 tsp

salt

2 tbsp

heavy whipping cream or milk