Creating Crock-Pot Cowboy Casserole is straightforward if you follow these simple steps:

1. Brown the Beef: In a skillet over medium heat, brown the ground beef until no longer pink. Drain excess fat.
2. Combine Ingredients: In a slow cooker, add the browned beef, black beans, pinto beans, corn, diced tomatoes, taco seasoning, diced onion, and minced garlic.
3. Mix Well: Stir everything together until well combined. Make sure the seasoning is evenly distributed.
4. Cook: Cover the slow cooker and set it on low for 6 to 8 hours or high for 3 to 4 hours.
5. Add Cheese: About 30 minutes before serving, stir in the shredded cheddar and Monterey Jack cheese. Cover again and let it melt.
6. Season to Taste: Before serving, taste and adjust seasoning with salt and pepper if necessary.
7. Serve: Once the cheese has melted, it’s ready to be enjoyed!

These steps will guide you in creating this incredible casserole effortlessly.