Mexican Mac and Cheese Recipe

Ingredients

• 2 packages (7-1/4 ounces each) macaroni and cheese dinner mix
• 2 pounds ground beef
• 1 small onion, chopped
• 1 can (14-1/2 ounces) diced tomatoes, undrained
• 1 can (10 ounces) diced tomatoes and green chiles, undrained
• 1 can (8 ounces) tomato sauce
• 2 tablespoons chili powder
• 1 teaspoon garlic salt
• 1/2 teaspoon ground cumin
• 1/4 teaspoon crushed red pepper flakes
• 1/4 teaspoon pepper
• 2 cups sour cream
• 1-1/2 cups shredded Mexican cheese blend, divided