Chocolate Peanut Butter Bars

I found this Chocolate Peanut Butter Bar recipe at Hospitality at Heart and modified it a bit to use what I had on hand.  Since I didn't have any peanut butter chips, I used 2/3 cup of peanut butter and warmed it a bit in the microwave.

Chocolate Peanut Butter Bars

1 package graham crackers crushed (approx. 1 1/3 cups)
1 stick butter melted
1 can sweetened condensed milk
1/2 cup chocolate chips
2/3 cup peanut butter, warmed to make it easier to spread

Line baking dish with parchment paper.  Mix the crushed graham crackers and melted butter and press it into a baking dish.  Pour the sweetened condensed milk on top.  Sprinkle chocolate chips across the top of the sweetened condensed milk.  Drop the peanut butter by teaspoons on the top and swirl it through with a knife.  Bake at 300 degrees for 30 minutes.  Put in the refrigerator to cool and then cut into bars.