I found this recipe on the King Arthur Flour website. They taste just like peanut butter cups to me. I love that these are No-bake. They are easy to throw together and keep for a long time in your fridge. That is, unless you are like me and eat them in two days!
Peanut Butter Cup Bars
1 1/2 cups graham cracker crumbs
2 sticks butter, melted
2 1/2 cups powdered sugar
1 cup peanut butter
1 1/2 cups chocolate chips (I used 1/2 semi-sweet and half milk chocolate)
In a large bowl, combine the graham cracker crumbs, butter, powdered sugar and peanut butter.
Mix till well-combined.
Spread mixture in a lightly greased 9 x 13-pan. Chill in refrigerator for approximately 10 minutes.
While peanut butter layer is chilling, melt chocolate chips, in a microwave oven or in a double boiler on top of the stove.
Spread chocolate over peanut butter.
Cut bars into squares, but leave them in the pan. Return to refrigerator to chill for at least 1 hour. Store leftovers in the fridge, tightly covered.