Drain the mozzarella and cut into cubes. Wash the tomatoes and remove the stalk. Cut the tomatoes horizontally into slices about 1 cm wide. Whisk eggs and milk, season with salt, pepper and paprika
Heat 1 1/2 tablespoons of oil in a frying pan (24 cm Ø). Put half of the tomato slices inside and sprinkle with half of the frozen herbs, spread half of the cheese cubes on top. Place the remaining tomato slices, herbs and cheese cubes in the same order
Pour egg milk over it. Put a lid on the pan. Let the egg mixture set at low heat for about 15 minutes, moving it back and forth several times in the pan to prevent the mixture from sticking
When the surface is frittered, carefully remove the omelette from the edge of the pan and turn it out of the pan onto a sufficiently large, flat lid or plate. Heat the remaining oil in the pan. Carefully put the omelette back into the pan and cook for about 5 minutes without the lid.