Add the eggs and milk to a bowl with a pinch of salt and pepper and whisk together. Add the flour on a separate plate and set them both aside.
Cut the mozzarella into slices, medium thickness. Divide the mozzarella slices between two slices of crustless bread. Make sure no mozzarella is outside the edges of the bread.
Cover each slice of bread topped with mozzarella with another slice of bread to create a sandwich. Cut each sandwich diagonally to make triangles.
Add enough sunflower oil to a pan so it's 1/4 inch deep. Dip each triangle in flour making sure to cover all edges. One by one dip each triangle in egg quickly again making sure to cover all edges.
Place each egg dipped triangle in the oil and fry the sandwiches in batches until browned and crispy on each side.