Preheat the oven to 350°F.

In a bowl, beat the egg whites, salt, and sugar using a hand mixer or whisk until the sugar partially dissolves and the mixture becomes frothy.

Add the sifted flour all at once and mix until well combined.

Whisk in the melted butter and vanilla extract, continuing to mix until the batter is smooth and uniform. You want the batter to be soft and spreadable.

Place a silicon mat on an inverted sheet pan to line it.

Position the stencil in one corner of the pan. Using a small offset spatula, scoop a small amount of batter and spread it evenly over the stencil. Remove any excess batter.

Carefully lift the stencil and move it to another section of the pan, repeating the process until you have used all the available space.

Bake for 7 minutes, while preparing the setup for shaping and cooling the cookies. Secure rolling pins and have a cooling rack ready for the hot sheet.

Once the edges of the cookies turn brown and the desired color is achieved, remove them from the oven and place them near your setup.

Swiftly and carefully slide the offset spatula under each cookie, draping them over the tubes to shape and cool. Note that you have a limited time before the cookies harden.

Repeat the steps until all the batter is used, creating more cookies.