Simo and Cicci recommend

You can store the Brussels Sprouts Stuffed Meatballs for up to 2-3 days in the refrigerator, sealed in an airtight container; alternatively, you can prepare them in advance in the morning, keep them in the fridge, and cook them in the evening or the next day.

You can choose other cooking methods such as deep-frying in plenty of seed oil or air frying at 392°F for 15 minutes, turning them halfway through cooking.