Preheat and prep: Set oven to 350°F (175°C). Line a baking sheet with parchment paper.
Mix dry ingredients: In a bowl, whisk almond flour, protein powder, baking powder, salt, and sweetener until evenly combined.
Break up any clumps.
Combine wet ingredients: In a separate bowl, whisk melted butter, Greek yogurt, vanilla, and egg until smooth.
Bring it together: Add wet ingredients to dry. Stir with a spatula until a soft, thick dough forms. If it looks dry or crumbly, add 1–2 teaspoons almond milk.
If too wet, sprinkle in a little more almond flour.
Fold in chocolate chips: Gently mix until the chips are evenly distributed.
Shape the cookies: Scoop 10–12 mounds (about 2 tablespoons each) onto the sheet. Lightly flatten; these don’t spread much.
Bake: 8–10 minutes, until edges are set and tops look just dry. Don’t overbake; they’ll firm up as they cool.
Cool: Let cookies rest on the sheet for 10 minutes, then move to a rack.
This helps them set and stay chewy.