Zucchini Pizza Boats

These taste like a pizza- carb free.
ingredients:

4 zucchini, sliced in half lengthwise
1 cup tomato sauce (I used chunky cherry tomato and chillies sauce, see pic)
1 cup shredded mozzarella
1/2 cup shredded Parmesan cheese or mix (I used Parmesan and fontina)
1- 1/2 cups fresh baby spinach
1/2 cup sliced olives
1 cup sliced sauteed mushrooms
olive oil

Hollow out zucchini and place in a casserole dish that you have greased with a little olive oil. Top with spinach, mushrooms and sauce. Add olives and cheeses. Bake in a preheated 375 degree oven, covered until cheese is bubbly and zucchini are tender.