Remove all the wrappers and refrigerate the Rolo candies. Pre-heat oven to 325F. Prepare brownies according to package directions. Grease a 24 cup mini muffin tin with cooking spray and fill each cup 3/4 full with batter. Bake for 15-20 minutes until a toothpick inserted comes out clean. Remove from oven and immediately press a Rolo, smaller side down, into the center of each brownie bite until the top of the Rolo is even with the top of the brownie bite. Cool for a couple of minutes then carefully remove the brownie bites from the pan to a cooking rack. Allow to cool completely.