Mix the flour, the baking soda, and the salt.

In another bowl mix the white sugar, the brown sugar, the melted butter, the egg and the vanilla.

Incorporate the flour slowly until the mix has a paste consistency.

Make small balls and place them on a nonstick oven sheet and take it to the oven for 10 minutes.

Once out, let them in the oven sheet for a couple minutes. Then transfer the cookies to a cooling rack.