Spicy Mac and Cheese Soup

Ingredients (10)

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