Pillsbury Everyday Family Suppers 2007cookbook (pg. 330). Only they put peanuts in the cookies and I don't. I prefer to just add more Reese's Pieces to make up for the lack of peanuts :). You'll notice they use a cake mix for the dough, which I love.
Here's the recipe:
1 box chocolate cake mix
1/2 c. butter or margarine, softened
1 bag (14 oz.) Reese's Pieces candies
(see, told ya it was easy!!!)
Heat oven to 350. Grease cookie sheets. In a large bowl beat cake mix, butter and eggs with electric mixer until just moistened. With a spoon stir in the Reese's Pieces. Drop by rounded tablespoons onto cookie sheet. Bake for 7 to 10 minutes.
Or if you're feeling adventurous, just use the basic dough recipe and throw in whatever candy sounds good to you! Let me know if you find a good combination.