How Do You Stiffen Frosting With Cool Whip?
To stiffen frosting with Cool Whip, start by placing the Cool Whip in the refrigerator for a few hours to thaw. Once the Cool Whip has thawed, gently fold in powdered sugar until it reaches the desired consistency. If the frosting is still not stiff enough, add a small amount of cornstarch and continue to fold until it reaches the desired consistency. Finally, chill the frosting in the refrigerator for at least an hour before using it on your cake or cupcakes.