Avoid leaving the frosted cake out for more than 30 minutes, or add a stabilizing ingredient like cream of tartar ... addition to the recipe. To firm the Cool Whip frosting without changing ...

In a medium bowl, whisk together the flour and cream of tartar. Set aside ... continue to beat for 5 to 8 minutes, until the frosting is cool and holds its shape. Sugar Momma's Nifty Gadget ...