Preheat the oven to 350℉. Lightly spray 8 muffin cavities in a standard sized-muffin tin with cooking spray. Set aside.
In a large bowl, mix together the eggs, Greek yogurt, butter, sugar and vanilla.
In a medium bowl, mix together the flour, protein powder and baking powder.
Slowly mix the dry ingredients into the wet ingredients until just combined. Fold in the chocolate chips.
Using a large cookie scoop, scoop the batter evenly into the prepared muffin tin. Bake in the preheated oven for 17-20 minutes, or until a toothpick inserted comes out clean.
Allow to cool for 5 minutes in the pan before transferring to wire racks to cool completely.
Notes
I find it easier to use a silicone muffin tin to remove the muffins easier from the pan. I love this silicone muffin pan.