To make this Chocolate Mint Brownies Recipe gluten free, replace the all-purpose flour with a certified gluten-free 1:1 baking flour blend. Verify that the chocolate chips, cocoa powder, powdered sugar, peppermint extract, vanilla-free flavorings if used, cream cheese, whipping cream, food coloring, and all packaged ingredients are labeled gluten free or free from gluten-containing additives. Use clean mixing bowls, utensils, measuring cups, saucepans, and a clean baking dish to prevent cross-contact with gluten-containing ingredients.