Preheat the oven to 180°C.
Chop the almonds finely.
In a bowl, mix protein powder, cocoa powder, almond flour, baking powder, and erythritol.
In another bowl, beat eggs, milk, olive oil, and vanilla extract together.
Combine the two mixtures and mix thoroughly.
Add the chopped almonds and dark chocolate chips, then mix evenly.
Pour the batter into muffin tins and bake for 20 minutes.