The phrase "unfrosted cupcake" refers to a cupcake that does not have any frosting or icing on top. It means a plain cupcake without any decoration. Full definition
Store leftover unfrosted cupcakes in an airtight container in the refrigerator for up to 4 days or in the freezer for up to 3 weeks. (chefambershea.com)
Store leftover unfrosted cupcakes in an airtight container in the refrigerator for up to 4 days or in the freezer for up to 3 weeks. (chefambershea.com)
Well, I suppose muffins are very much like unfrosted cupcakes but this one really tastes like cake. (foodbabbles.com)