The phrase "cup cornstarch" means to measure one cup's worth of a powdery substance made from corn that is commonly used for thickening sauces and soups. Full definition
Meanwhile, whisk flour, baking powder, kosher salt, and 1/2 cup cornstarch in a medium bowl. (bonappetit.com)
Flour 1 cup all - purpose flour = 120 grams (King Arthur), 141 grams (Cook's Illustrated), 130 grams (Smitten Kitchen, at least 80 % of the time) 1 cup cornmeal = 240 grams 1 cup cornstarch = 128 grams (smittenkitchen.com)
Homemade Marshmallows Ingredients: 3 packages unflavored gelatin 1 cup ice cold water, divided 1 1/2 cups granulated sugar 1 cup light corn syrup 1/4 teaspoon kosher salt 1 teaspoon vanilla extract 1/4 cup confectioners» sugar 1/4 cup cornstarch Nonstick spray Food coloring or flavoring oil (optional) Directions: Place the gelatin into the bowl of a stand mixer along with 1/2 cup of the water. (gourmetmomonthego.com)