Preheat your oven to 350ºF. Line 12 regular muffin holes with parchment paper liners.
In a blender container, add coconut oil, baby spinach, banana, avocado, protein powder, dates, and coconut milk. Blend until smooth.
Add the eggs, oats, baking powder and baking soda to the blender container. Blend again until a batter is formed. Quickly blitz in lemon juice.
Scoop the muffin batter into the lined muffin holes. Bake for approximately 20 minutes, or until a toothpick inserted into the middle of a muffin comes out clean.
Remove from oven. Remove muffins from muffin holes while still warm to prevent sticking. Let cool and enjoy!