No Bake Chocolate Oatmeal Cookies

1/4 cup cocoa
1 stick butter
2 1/2 cups sugar
1/4 cup peanut butter
1/2 milk
2 cups oats
Mix cocoa, milk, and sugar. Bring to a rolling boil for 2.5 min. Add butter and let it melt. Add peanut butter and mix; then add oats. Spoon on wax paper. Let cool. 18 cookies