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Clean mushroom and then rub mushrooms with a little olive oil.
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In two tablespoon of olive oil, saute the onion for about 3-4 minutes. Stir in the crushed garlic, 1 cup bok choy, sun-dried tomatoes and zucchini, sauté until vegetables are almost done. 5-6 minutes. Add in the roasted bell pepper and then take off the heat until it has cooled. Mix in the mozzarella cheese.
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Stuff the mushroom caps with the vegetable filling and then top with parmesan cheese.
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Drizzle the mushrooms with some of the remaining olive oil and balsamic vinegar.
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Bake in 350° oven for about 10-15 minutes or until the cheese starts to brown and the portobello looks cooked.