Pumpkin Peanut Butter Cups

I love all things pumpkin and fall so I figured a pumpkin recipe would be a great place to start.  I've seen a couple of pumpkin peanut butter cup recipes on other blogs and tried one out, but the filling was simply pumpkin and peanut butter mixed together and wasn't really what I wanted.  That said, I'm spoiled when it comes to homemade peanut butter cups because for years my mom has been making a recipe that is pretty much spot on for those treats that come in the orange packages.  I figured that I'd get closer to the taste I was wanting if I modified that recipe.  It's also a cinch to make since it goes in a 9x13 pan rather than having to fill individual cups.  I used homemade pumpkin puree for this recipe, but canned should work just fine as well.  The result is still distinctly peanut butter cup but with a hint of pumpkin and spice. 

Pumpkin Peanut Butter Cups

14 tablespoons butter (1 stick + 6 tablespoons)
1 cup pumpkin puree
3 3/4 cups powdered sugar
1 1/4 cups peanut butter
1 1/4 cups graham cracker crumbs
1 1/4 teaspoons pumpkin pie spice
12 ounce package semi-sweet chocolate chips

Melt the butter in a saucepan. Remove from heat and mix in powdered sugar, pumpkin, peanut butter, graham cracker crumbs and pumpkin pie spice. Press peanut butter mixture into an ungreased 9x13 pan. Melt chocolate chips in a double boiler or the microwave and spread over the top of the peanut butter mixture. Cool completely then cut into squares.