Preheat oven to 350 degrees.
Place a paper cupcake liner in each cup of 2 standard muffin pans.
To make the crust, in a bowl, combine graham cracker crumbs, sugar and melted butter until crumbs are moistened.
Press crust into bottom of each muffin cup.
Put 1 peanut butter cup into center of each crust.
Beat cream cheese with a hand-held mixer until fluffy.
Add sugar, flour and vanilla, beating well.
Add eggs, 1 at a time, beating well after each addition.
Spoon cream cheese mixture over peanut butter cups and graham cracker crusts.
Bake until just set, about 20 minutes.
Allow to cool completely before serving.