1. Preheat oven to 375 degrees.
2. Place the slices of portobello mushrooms on a lined sheet and bake for 5 minutes or until tender.
3. Remove from the oven and top them with marinara sauce and as much basil, arugula, grilled chicken and part-skim mozzarella cheese as you'd like to each slice.
4. Place the slices back into the oven for 15-18 minutes.
