In a large bowl mix together eggs, milk, coconut oil and vanilla extract.
Add in flour, baking powder, salt, sugar, cinnamon and nutmeg into a separate bowl.
Gently mix the flour mixture into the egg mixture and combine.
Zest the lemon directly into the bowl and add in the blueberries.
Bake for 20-25 minutes until top has set.
In a medium bowl mix brown sugar and butter by hand. Sprinkle on top of each muffin and bake for an additional 5 minutes. The mixture will melt and then harden once the muffin has cooled.
Once the top has cooled you are ready to serve with a fruit salad and orange juice for a complete meal!