Spicy Mac and Cheese Soup

Details

Ingredients

• 2 (7.25 ounce) packages macaroni and cheese mix
• ¼ cup butter
• 2 cups chicken broth
• 1 (14.5 ounce) can diced tomatoes with green chile peppers
• 1 tablespoon garlic powder
• 1 teaspoon ground cumin
• 1 teaspoon dry mustard powder
• ½ teaspoon ground black pepper, or to taste
• 1 ½ cups milk
• ¾ cup sour cream, divided