I used to think rainbow cookies were sugar cookies covered in multi-colored sprinkles – I grew up in a small rural town, cut me some slack – until I finally came across a true Italian rainbow cookie.

A detailed homemade version of Italian rainbow cookies with beautiful layers and rich flavor perfect for special occasions.

Beat egg whites in an electric mixer fitted with a whisk attachment on high until they just hold stiff peaks. Add ½ cup sugar and continue beating until whites hold stiff slightly glossy peaks. Remove ...