INGREDIENTS
1
box yellow cake mix, plus ingredients to make the cake (likely 3 egg whites, water, and oil)
18
Nutter Butter cookies, each chopped into 6 pieces; plus about 8 more cookies for garnishing
1 1/3 cups
creamy peanut butter
1/2 cup
unsalted butter, softened
2 cups
confectioners’ sugar
1 tsp
vanilla extract
about 1/4 cup cream or milk, plus more if necessary for consistency