Cheese, Broccoli, and Chicken Soup

INGREDIENTS

• 2 tablespoons vegetable oil
• 1 small onion, chopped
• 1 pound skinless, boneless chicken breast halves - chopped
• 2 (32 fluid ounce) containers chicken broth
• 1 large head fresh broccoli, cut into bite size pieces
• 8 ounces processed cheese food, shredded
• 1 cup shredded Cheddar cheese
• salt and pepper to taste
• 4 cups uncooked instant rice