In a skillet over medium heat, brown the ground beef until fully cooked. Drain excess fat.

Add the chopped onion, bell pepper, and minced garlic to the skillet and sauté for 3-4 minutes until softened.

Transfer the cooked beef and vegetables to the crockpot.

Add diced tomatoes, kidney beans, black beans, corn, and spices to the crockpot.

Stir well to combine all ingredients.

Cover and cook on low for 8 hours or high for 4 hours.

Serve hot, garnished with your choice of toppings like cheese, sour cream, or green onions.