Cheese Fudge

3/4 cup cubed or shredded Velveeta or grated Cheddar cheese
1/4 pound butter or margarine
1 teaspoon vanilla extract
3 cups confectioners' sugar
1/4 cup cocoa powder

Melt cheese and butter. Remove from heat. Add confectioners' sugar, vanilla extract and cocoa. Make it into a ball; knead, and press into a buttered 8-inch square pan. Chopped nuts are optional. DO NOT refrigerate.