Heat oven to 375. Saute onion in olive oil in deep skillet over med heat, 4 min. Add cut squash; saute 4 min. Add corn, bell pepper, 1/2 tsp salt & pepper; saute 2 min.
Spread 1/2 mixture in buttered, 2 qt dish. Sprinkle with 1/2 Pepper Jack cheese. Top with remaining squash, then Pepper Jack cheese.
Stir flour into cream and blend; pour over gratin. Mix bread crumbs & parmesan then sprinkle on top. Bake 40-50 min until light brown on top. Let stand 10 min before serving.
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