Chop the garlic. Cut the tomatoes into medium cubes.
Cut the mozzarella into medium-thick slices. You will need 8-10 slices.
Separate the mushroom stems from the caps. Remove the mushroom pulp with a spoon or knife - this way there will be more room for the filling.
Place the mushroom caps in a baking dish, previously greased with oil. Place the dish in the oven and bake the mushrooms for 10 minutes at 180 °C.
Remove the mushrooms from the oven and stuff them in the following order: garlic, mozzarella, tomatoes.
Cover each cap with a slice of processed cheese and place the mushrooms in the oven for 10 minutes at 180 °C.
Serve the mushrooms hot, garnished with finely chopped fresh herbs.