Preheat your oven to 425°F and line a 12-cup muffin tin.
In a large bowl whisk flour, protein powder, baking powder, baking soda, salt, cinnamon, and lemon zest.
In a separate bowl whisk eggs, yogurt, oil, maple syrup, vanilla, and milk.
Pour wet into dry and gently fold to combine (don’t overmix).
Fold in blueberries.
Fill muffin cups almost to the top for bakery domes (smooth out if lumpy).
Add optional bakery topping: a little smear of butter + sprinkle of turbinado sugar.
Bake at 425°F for 6 minutes, then reduce heat to 350°F and bake 14–18 minutes. Don’t open the oven during the heat change.
Cool 10 minutes in the pan before removing.