Each holiday season Costco gives out a cookbook. I haven't really tried everything in all the ones that I have, but I did find this gem amongst others that are quite delicious. Also they are super quick and easy, which is always a bonus in my book!
What you need:
1/3 cup vegetable oil
1 pouch Ghirardelli Triple Chocolate Brownie Mix
1 cup peanuts chopped (optional)
Peanut Butter Filling:
1 1/4 cups (14 oz. can) Sweetened condensed milk
1/2 cup peanut butter
Preheat oven to 350 degrees. Lightly grease a 13x9x2 inch pan.
In a medium bowl, stir together oil and eggs. Add brownie mix and peanuts; stir until moistened. Press half of the brownie mixture into the pan, reserving the remainder for topping.
To make the filling, stir sweetened condensed milk and peanut butter in a medium bowl until smooth. Spread evenly over the brownie layer in the pan.
Drop rounded teaspoonfuls of the reserved brownie mixture over the peanut butter layer.
Bake for 25-30 minutes, or until the top is set and a toothpick comes out clean. Cool thoroughly before cutting. Makes 24 bars!