Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
Clean the portobello mushrooms by gently wiping them with a damp cloth. Remove the stems and gills with a spoon to create more space for the filling.
In a mixing bowl, combine the halved cherry tomatoes, mozzarella, chopped basil, minced garlic, balsamic glaze, olive oil, salt, and pepper. Toss the ingredients together until everything is well mixed.
Take each portobello cap and place it on the prepared baking sheet, gill side facing up. Generously fill each mushroom with the caprese mixture, mounding it slightly in the center.
Bake in the preheated oven for about 20 minutes, or until the mushrooms are tender and the cheese is melty and golden.
Remove from the oven and let cool for a few minutes. Garnish with additional fresh basil leaves if desired before serving.
Notes
Garnish with additional basil leaves for a fresh touch.