First, preheat your oven to 375°F (190°C). Gently clean the mushroom caps with a damp paper towel to remove any dirt. Carefully snap off the stems and use a spoon to scrape out the dark gills from the underside. This creates more room for the delicious filling.
Place the cleaned mushroom caps on a baking sheet. Brush both the inside and outside of each cap with olive oil. This step is important as it prevents them from drying out in the oven and adds a layer of flavor. Season them generously with salt and freshly ground black pepper.
Now for the fun part! Begin layering the ingredients inside each mushroom cap. Start with a few slices of fresh mozzarella, followed by a handful of halved cherry tomatoes. Top it all off with a sprinkle of fresh basil ribbons. Don't be afraid to pile the fillings high.
Place the baking sheet with the stuffed mushrooms into the preheated oven. Bake for about 10 minutes. You'll know they're ready when the mushrooms are tender and the mozzarella has melted into a gooey, delicious blanket over the tomatoes and basil. The aroma will be irresistible.