I received this one from Gluten Free Pantry:

Ingedients:
1 bag GFP Old Fashioned Cake and Cookie Mix (#126029M) or “Cause You're Special Moist Yellow Cake Mix (#956012)
1 cup peanut butter, smooth or crunchy
1/2 cup melted butter
2 eggs

Filling:
1 cup semi-sweet chocolate chips
1, 14 oz. can sweetened condensed milk (I use the low-fat condensed milk)
2 Tbs. butter

Preheat oven to 350°. In mixer, combine mix, peanut butter, butter and eggs. Mix until dough forms a ball. Remove 1 cup of dough and set aside.
Press remaining dough into the bottom of a lightly oiled 9 x 13 baking pan.

In a microwavable bowl, combine chocolate chips, condensed milk and butter. Microwave on medium heat 1-2 minutes or until chips have melted.
Stir to get a smooth consistency. Pour chocolate over dough layer.
Crumble remaining dough and sprinkle over the chocolate filling. Bake 25-30 minutes or until chocolate is no longer shiny. Surface will look wrinkled. Remove from oven. Cool completely or refrigerate before cutting into bars.

Makes 16 bars