Step 1- FOR BROWNIES: make your favorite brownie mix. line an 11x17 inch jelly roll pan with parchment paper. pour dough onto parchment. cook dough until toothpick comes out clean. let cool completely.
*FOR COOKIES: make your favorite cookie dough and cut out into desired shapes and bake.
Step 2- invert the brownies onto a work surface and peel off the parchment, keeping the bottom of the brownies facing up.
Step 3- use a cookie cutter to cut out an even amount of shapes. put a scoop of ice cream in between 2 cutouts to form a sandwich. serve ice cream sandwiches immediately, or place them on a baking sheet lined with parchment or waxed paper and cover tightly with plastic wrap. can be frozen for up to 3 days.