Slow Cooker Cactus Chili

Name: Slow Cooker Cactus Chili
Ingredients: 2 pounds ground beef; 1 large onion, chopped; 2 (28 ounce) cans diced tomatoes; 2 (15.25 ounce) cans black beans, drained; 2 (15.25 ounce) cans yellow corn, drained; 1 (30 ounce) jar diced nopales (cactus); 1 (8 ounce) can tomato paste; 3 tablespoons chili powder; 2 tablespoons white sugar; 1 chipotle pepper, chopped; 2 teaspoons garlic powder; 1 teaspoon ground cumin; 1 teaspoon salt; 1 teaspoon ground black pepper