The phrase "little cornstarch" means a small amount of a powdery substance made from corn used for thickening sauces and soups.
Sentences with «little cornstarch»
I added a little cornstarch at the end to thicken it. (isachandra.com)
Just before the chicken marsala is done I toss in a few cherry tomatoes and a little cornstarch to thicken the sauce. (blessherheartyall.com)
What makes them soft & chewy is the fact that we're using melted better, adding a little cornstarch to the batter, and slightly under baking the cookies. (justsotasty.com)