No-Bake Chocolate Oatmeal Cookies

Why I Love This Recipe
This is another receipe that I got from Cosmopolitan Magazine (November 2008 issue). And it was adapted from 'The Comfort Table' by Kathie Lee Joel.
Ingredients You'll Need
2 cups sugar
8 Tbsp. (1 stick) unsalted butter
1/3 cup cocoa powder
1/2 cup milk
1 tsp. vanilla extract
1/2 cup peanut butter (creamy or crunchy; I used creamy)
2 1/2 to 3 cups rolled oats
Directions
In a medium saucepan, combine the sugar, butter, cocoa, milk, and vanilla.
Bring to a slow boil, and simmer until the sugar had dissolved; stir in the peanut butter, remove from heat.
Stir in 2 1/2 cups of oats (mixture should be thick); add the remaining 1/2 cup of oats if necessary.
Line a cookie sheet with parchment paper; drop the mixture by the heaping tablespoonful onto the parchment.
Allow the cookies to firm up at room temperature, about one hour.