Cook elbow macaroni according to al dente package directions.
Drain pasta and immediately return to pot.
Add cheeses, sour cream and milk to pot with macaroni and return pot to stove an medium heat.
Stir to combine and help ingredients to start melting evenly. Add salt, garlic powder and dried mustard and stir to combine.
Continue to cook on medium heat until all cheese has melted and ingredients come together into a creamy sauce. If necessary more milk can be added if sauce is too thick.
Serve immediately.
Serving: 0g | Carbohydrates: 0g | Protein: 0g | Fat: 0g | Saturated Fat: 0g | Polyunsaturated Fat: 0g | Monounsaturated Fat: 0g | Trans Fat: 0g | Cholesterol: 0mg | Sodium: 0mg | Potassium: 0mg | Fiber: 0g | Sugar: 0g | Vitamin A: 0IU | Vitamin C: 0mg | Calcium: 0mg | Iron: 0mg