Preheat large skillet on medium heat and add oil. Add garlic and saute for 1-2 minutes or until fragrant, stirring frequently.
Add chicken broth, cornstarch, salt, pepper and whisk until smooth. Bring to a boil, reduce heat to low and simmer for a 1-2 minutes until sauce has thickened a bit.
Remove skillet from heat, add Parmesan cheese and whisk until smooth and cheese has melted.
Add yogurt and stir again until smooth. That's it, serve with noodles or chicken.
Notes
Store: Refrigerate in an airtight container for up to 5 days.
Freeze: I don't recommend to freeze this alfredo sauce because often milk, cheese and yogurt separates after thawing. Enjoy fresh and it's quick to make.
Reheat: Reheat in a microwave or by simmering on low heat in a small pot with a splash of milk, stirring constantly so it doesn't burn.