Remove the stems, wash and dry the mushrooms with a paper towel.
Preheat the oven to 375F/190 C.
Mix the oil with the garlic, salt, and pepper in a bowl.
Brush each mushroom with the oil mixture and place them on a baking sheet.
Bake for about 5 minutes in the preheated oven until the moisture starts to come off the mushrooms, turning them over once.
Remove them from the oven, and spread the pizza sauce.
Add 1-2 leaves of fresh basil and top with mozzarella and pepperoni slices.
Bake for another 5 minutes or until the cheese starts to melt.
Enjoy with more fresh basil on top.