Gather all ingredients.
Beat shortening in a large bowl until creamy. Gradually mix in confectioners' sugar in small amounts, alternating with 5 tablespoons milk, until smooth. Mix in vanilla and continue to beat until frosting is stiff and glossy, about 5 minutes, adding more milk if needed.
Mix in food coloring, separating into smaller bowls if using multiple colors.
Spread frosting on cookies or fill piping bags and decorate cookies as desired.
