Place the eggs, milk, butter, and salt in the blender and blend for 1 minute
Add the rice flour and oats and blend a bit more
Remove from the equipment and add the baking powder, stirring with a whisk
Filling
In a dish, add the broccoli, carrot, and season with salt and oregano, mix well
Assembly
Pour half of the batter into a greased and floured 9.05 inch x 13.38 inch (23 cm x 34 cm) rectangular pan, then add the vegetable filling, followed by the grated mozzarella cheese, and finish with the remaining batter
Bake in a preheated 392°F (200ºC) oven for about 45 minutes