saute onion, mushrooms, ham, and tomatoes in olive oil until veggies are tender let cool slightly.

cut zucchini in half and scoop out small amount down the center of each half

in small bowl mix veggies/ham mixture with the panko and parmesan cheese. fill zucchini

top with the shredded cheese

either bake @350 until zucchini is tender and cheese is melted. or wrap in foil and grill over medium heat for 20 - 25 minutes