Start by baking your favorite brownie recipe in a 9x13 pan. Allow them to cool completely before proceeding.
Crush the Thin Mint cookies into fine crumbs using a food processor or place them in a zip-lock bag and crush with a rolling pin. Set aside a handful of crumbs for garnishing.
In a mixing bowl, combine the crushed Thin Mint cookies with the low-fat cream cheese. Mix until well blended and smooth to create the truffle layer.
Spread the cream cheese and cookie mixture evenly over the cooled brownies using a spatula.
In a microwave-safe bowl, combine the chocolate chips and Crisco. Microwave in 30-second intervals, stirring in between, until the chocolate is fully melted and smooth.
Pour the melted chocolate over the cream cheese layer, spreading it evenly with a spatula to cover the entire surface.
Place the brownies in the refrigerator for at least 1 hour, or until the chocolate has set.
Remove the brownies from the fridge, cut into squares, and garnish with the reserved cookie crumbs. Enjoy!