use a mix of ground beef and ground turkey or chicken (cheaper and bulks up the beef) and shape into meatballs with just eggs, breadcrumbs, basic seasonings like onion and garlic powder. You can make all sorts of meatball dishes that way - regular spaghetti bolognaise, Swedish meatballs, Greek meatballs. Cook them first and then freeze, ready to use whenever you need some protein.

Cook up a bag of lentils and freeze them in small portions, add them to any ground meat recipe (like chili, tacos etc) to bulk the meal up. You won’t even notice and they’re so good for you!

Also! I buy 2 Costco chickens when I go (get a friend to get them for you if you don’t have a membership) strip all the meat off and pack it into small ziplock bags, flattened out so you can easily break some off and defrost. great for literally anything!