Preheat your oven to 400 degrees f. and line a large baking sheet with parchment paper.
Lay your tomato slices onto the prepared baking sheet.
In a medium-sized bowl combine your shredded mozzarella with basil, garlic, sea salt and pepper.
Top each tomato slice with your cheese mixture, and then pepperoni as shown.
Bake in your preheated oven for 5-7 minutes, or until the cheese is melted. Do not overbake!
Serve immediately and enjoy!