Preheat your oven to 400 degrees f. and line a large baking sheet with parchment paper.
Arrange your tomato slices on the prepared baking sheet and sprinkle with a pinch of sea salt.
In a small bowl, whisk together the parmesan cheese with chopped basil, garlic powder and ground pepper.
Sprinkle a spoonful of the parmesan mixture over each slice of tomato.
Bake for 10 minutes, until the cheese is nice and melty.
Serve immediately and enjoy!