Rolo Cookies

2 1/2 cups flour
3/4 cup cocoa
2 teaspoons vanilla
1 teaspoon baking soda
1 cup sugar
1 cup brown sugar
1 cup butter
2 eggs
sugar crystals for rolling the cookies
1 bag rolos

Preheat oven to 375. Mix dry ingredients and set aside. Cream butter, sugar, brown sugar. Add eggs and vanilla. Add dry ingredients. Chill for about one hour. Make into 1 inch balls, place rolo inside each cookie and roll in sugar crystals. Bake for 10 minutes.