Storage: Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat covered in a 350°F oven for 15–20 minutes with a splash of water or broth in the dish to prevent drying out. Freezing: Assemble unbaked stuffed peppers, wrap individually in plastic wrap and then foil, and freeze for up to 3 months. Thaw overnight in the refrigerator before baking as directed. Rice tip: Day-old rice that has been refrigerated holds its texture much better inside the pepper than freshly cooked hot rice. Brown rice or cauliflower rice can be substituted 1:1. Protein swaps: Ground turkey, ground chicken, or Italian sausage all work beautifully. For a plant-based version, use 1 can of lentils and 1 can of black beans, drained, in place of the beef.