Preheat your oven to broil.
Heat the your oil in a large oven-proof skillet over medium-high heat.
Cook your zucchini rounds until lightly golden brown, 1-2 minutes on each side, then lightly season with sea salt and pepper.
Top each round with a slice of tomato and a generous pinch of shredded mozzarella cheese.
Transfer to the oven and broil until the cheese has melted, 1 to 2 minutes.
Garnish with chopped herbs and enjoy!