1.In a bowl of an electric mixer with paddle attachment, combine unsalted butter, sugar, and brown sugar and beat until well-combined and creamed (about 1-2 minutes on high speed).
2.Add egg, vanilla, and almond extracts and mix again until well-combined. Plug in the waffle iron so it begins warming up.
3.In a separate bowl, whisk together flour, cornstarch, baking powder, baking soda, and salt. Gradually stir dry ingredients into wet with a spatula until completely combined.
4.Scoop approximately 2 Tablespoons of cookie dough and form into a ball. Flatten as evenly as possible.
5.Gently but firmly close the waffle iron and cook until cookie is golden brown, about 90 seconds. To remove the cookie, carefully tilt the waffle iron onto a cooling rack. Repeat with remaining cookie dough until all cookies have been cooked.
6.Serve cookies once they have cooled.