Preheat the oven to 420°F.
Place a 8×10-inch (20×25 cm) baking dish inside the oven.
Use a whisk to beat the eggs in a large bowl until frothy.
Add milk, flour, maple syrup, baking powder and sea salt. Keep whisking until smooth.
Now place the piece of butter into the warm baking dish in the oven. Remove the dish as soon as the butter has melted and pour it into the batter.
Pour the batter into the dish and place back in the oven and bake for around 30 minutes or until nicely browned and set.
Let cool slightly and serve with fresh berries, fresh mint and a dollop of yogurt. Dust with coconut flour (or powdered sugar) for a fancier presentation.