Peanut Butter Cake

1 (18.25 ounce) box yellow cake mix
1 cup water
1/2 cup evaporated milk
1/2 cup peanut butter
2 eggs

Mix all ingredients together and bake according to cake mix box. When cool, ice with Peanut Butter Icing.

Peanut Butter Icing:
3 cups confectioners' sugar
1/2 to 1/3 cup milk
1/4 cup peanut butter

Blend sugar and peanut butter. Slowly stir in milk until thick enough to spread. Spread over cooled cake.