Coarsely grind the almonds in a food processor and transfer to a bowl. Add in the sugars and cinnamon. Stir to combine. Next add in the egg whites and water and mix again. Gradually add in the all-purpose flour until a dough forms.
Allow the dough to rest in the refrigerator for 30 minutes and preheat the oven to 350℉.
Once chilled, roll out the dough on a piece of parchment paper to ¼ inch thickness and cut diagonal lines in the dough to form diamonds. The dough will be sticky, and you can add a tablespoon of flour on top to roll it out. Do the best you can to roll out and cut the cookies, then transfer them to a baking sheet lined with parchment paper, allowing for space in between cookies. Reshape them back into diamonds as needed.
Bake the cookies at 350℉ for 10-15 minutes until the cookie has set but before they brown.
Remove and let cool. Enjoy!