3. In a medium bowl, beat cream cheese with an electric mixer until fluffy. Add sugar, flour, and vanilla bean paste and mix thoroughly. Add eggs, 1 at a time, beating well after each addition. Spoon cream cheese mixture over peanut butter cups and graham cracker crusts, making sure the peanut butter cup is completely covered. Tap muffin tin on counter to flatten out top and get rid of bubbles. Bake until just set, about 20-25 minutes. Allow to cool completely before serving.