1. Brown the Beef and Aromatics:
- In a skillet over medium heat, cook the ground beef with chopped onion and minced garlic until the meat is browned and the onions are soft.
- Drain any excess fat.
2. Assemble the Casserole:
- Transfer the beef mixture to your slow cooker.
- Add the cream of mushroom soup, milk, kidney beans, diced tomatoes with green chilies, corn, chili powder, salt, and pepper.
- Stir everything together.
- Add the sliced potatoes, ensuring they are well coated with the beef and bean mixture.
3. Slow Cook:
- Cover and cook on low for 6-7 hours or on high for 3-4 hours, depending on your time.
4. Add Cheese and Serve:
- In the last 20 minutes of cooking, sprinkle the shredded cheese on top and let it melt before serving