100 Cookies: The Baking Book for Every Kitchen, with Classic Cookies, Novel Treats, Brownies, Bars, and More by Sarah Kieffer is a comprehensive baking cookbook featuring 100 recipes for cookies, brownies, blondies, bars, and other sweet treats. Published by Chronicle Books in 2020, it is particularly useful for home bakers looking to master both classic recipes and more creative modern baking techniques.

The book is organized into sections covering classic cookies, brownies and blondies, fruit-based treats, advanced recipes, playful creations, pan-banging cookies, mix-and-match recipes, and baking extras. Kieffer's famous pan-banging technique, which produces cookies with crisp edges and rippled centers, is one of the book's highlights.

Recipes include Classic Chocolate Chip Cookies, Pan-Banging Ginger Molasses, Double Chocolate Espresso Cookies, Olive Oil Sugar Cookies with Blood Orange Glaze, Crème Brûlée Cheesecake Bars, Snickerdoodles, and Marshmallow Peanut Butter Brownies. The book also provides detailed techniques, tips, and full-colour photography throughout.