Chocolate Oatmeal Haystacks (contains peanuts)

I haven't tried this recipe, but they all seem to be roughly the same ingredients.

2 cups sugar
3 Tbsp. cocoa
1 stick butter
1 Tsp. vanilla
2 cups oats
1/2 cup milk
1/2 cup peanut butter

Mix sugar, cocoa, milk, butter and vanilla. Bring to a boil; cook and stir 5 minutes. Remove from heat and stir in peanut butter; then add oats. Spoon on to waxed paper or greased aluminum foil or a cookie sheet; cool.