Maybe you’ve gone full Julie & Julia, working your way through Mastering the Art of French Cooking. Maybe you simply love dessert. Wherever you fall on the culinary spectrum, one thing’s for sure: You can bake an incredible cookie. Even if you think you can’t. Most come together without too much of a fuss and bake in minutes (note that we said “most”—ahem, macarons!). That’s why we’re challenging you to try your hand at what we’ve deemed the 21 essential types of cookies to master. Conquer these, and you’ll be every bit the connoisseur as that blue guy from Sesame Street.