Place a cupcake liner in each of the 12 circles in your cupcake tray.
Now, scoop a level, 1/4 cup of the graham cracker crumb mixture into your 1/4 cup measure...then use your thumb to pack the crumbs firmly into the bottom of the measure, and use your thumb again to put a circular indentation into the center of each.
Now...turn the cup upside down, and tap...tap...tap it several times to release the graham cracker circle.
(This could take about 6-8 taps...so be patient). Once released, place the little graham circle (right side up) in the center of the cupcake liner.