Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
In a large bowl, combine protein powder with almond flour, baking powder and salt. Add egg, nut butter and vanilla extract (if using unflavored protein powder).
Using a fork or spatula, stir the protein dough until smooth.
If using, fold through the chocolate chips.
Scoop out portions of dough and gently shape them into cookies; avoid flattening them too much for a softer texture. Place them on the prepared baking sheet, spacing them apart.
Bake in hot oven for 8 to 12 minutes. Do not overbake or they will get dry; your protein cookies will firm up further as they cool.
