Creating this incredible casserole is simple with these steps:

1. Brown the Beef: In a skillet over medium heat, brown the ground beef until fully cooked. Drain any excess fat.
2. Combine Ingredients: In the slow cooker, add the cooked beef, kidney beans, black beans, corn, diced tomatoes, taco seasoning, and salsa. Stir to combine evenly.
3. Cook: Cover the slow cooker and set it on low for 6 to 8 hours or high for 4 to 5 hours.
4. Add Cheese: About 30 minutes before serving, sprinkle the shredded cheese over the top. Cover to let it melt.
5. Garnish: If desired, add chopped green onions, sour cream, or jalapeños as toppings before serving.

These steps will guide you in creating a dish that is not only delicious but also a hit with everyone at your table!