
Combine all ingredients, except chocolate chips, in a medium-sized bowl. Stir until the mixture is smooth and creamy. If it's too soft, add a little more powdered sugar. Press into a 9x13" pan and place in the refrigerator.
Melt chocolate chips in the microwave (at 50% power) for 1-2 minutes or cook on the stove over a double broiler. Stir chocolate and pour over the peanut butter mixture. Spread chocolate with a spatula. To even out chocolate, tap pan on the counter.
Refrigerate bars until chocolate has hardened (about 30 minutes). Allow to sit at room temperature for a few minutes before cutting so the chocolate doesn't crack. Enjoy!