Why You Should Avoid Cooking With Nonfat Greek Yogurt - Tasting Table
Briefly

While full-fat Greek yogurt is usually your best choice for cooking, nonfat Greek yogurt is a protein powerhouse but can result in grainy sauces when heated.
Stirring a spoonful of cornstarch into nonfat Greek yogurt can help keep dishes smooth by stretching out protein strands and adding thickening power.
Read at Tasting Table
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