Expired chocolate might affect your baking. When chocolate expires, it can develop a whitish film or change in texture, taste, and quality. If it’s only slightly past the expiration date, you can use it, but expect alterations in flavor and texture. Remove any visible mold or strange odors before using. For critical recipes, especially where chocolate is a dominant flavor, fresh chocolate is preferable. Yet, for recipes like brownies or chocolate-based desserts, you might get away with using expired chocolate by adjusting flavors or enhancing with extra fresh ingredients. Always trust your senses; if it smells or tastes off, avoid using it.