Preheat the oven to 180°C.
In a bowl, mix almond flour, protein powder, cocoa powder, and baking powder together.
Add eggs, unsweetened almond milk, erythritol, and vanilla extract, and mix well until combined.
Gently fold in chopped almonds and dark chocolate chips.
Divide the batter evenly into the muffin pan.
Bake in the oven at 180°C for 20 minutes.
Cool on a wire rack.