Preheat the oven to 400ºF. Line a baking sheet with parchment paper. Slice a loaf of French or Italian bread into ½-inch thick slices.
Place the slices of bread on the prepared baking sheet and spread ½ Tbps pesto over each piece.
Slice the Roma tomato into 8 slices, then top each piece of bread with two slices of tomato.
Finally, add a large pinch of shredded mozzarella to each piece of bread.
Bake the toast in the oven for about 10 minutes, or until the cheese is melted and the toast is brown and crispy on the edges. Baking time may vary depending on your oven and the type of bread chosen, so keep an eye on them. Serve warm!