Take out the stems of the portobello mushrooms and remove the dark membrane inside. This tends to be a bit bitter.
Put 2 tbsp of goat cheese in each mushroom cap. Press down with a spoon until it's spread evenly.
Top with arugula, tomatoes, and mozzarella. Spray baking sheet with olive oil.
Bake for 18 minutes at 400 degree. Enjoy.
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