Preheat your oven to 300°F (150°C).
Sift almond flour and powdered sugar together to remove lumps.
In a clean bowl, whip egg whites until foamy.
Gradually add granulated sugar while continuing to whip until stiff peaks form.
If desired, add gel food coloring and mix gently.
Fold the almond flour mixture into the egg whites using a spatula until well combined.
Transfer the batter to a piping bag fitted with a round tip.
Pipe small circles onto a parchment-lined baking sheet.
Tap the baking sheet to release any air bubbles.
Let the macarons sit at room temperature for 30-60 minutes until a skin forms.
Bake for 15-20 minutes, then cool completely before filling.