Preheat oven to 325 degrees and prepare a baking sheet with parchment.
In a medium bowl, sift almond flour and powdered sugar together. Set aside.
In a stand mixer with a whisk attachment, beat egg whites on high speed until they form soft peaks.
Lower the mixer's speed to medium and add sugar.
Put mixer back on the highest speed and beat until they form stiff peaks.
With the mixer still on high speed, add food coloring.
Take bowl off of mixer and add almond flour/sugar mixture.
Using a rubber spatula, aggressively fold in dry ingredients until the batter starts to loosen and becomes a little runny.
Put batter a pipping bag with a round tip.
Pipe 1 1/2" circles on prepared baking sheet and firmly tap the bottom of the tray so the batter flattens out.
Let them rest for 30-45 minutes until they form a skin.
Bake for 10-12 minutes, or until they are set.
Let cool before peeling them off parchment paper.