I have never fixed such a dish but here is my 2 cents.
I would cut my tomatoes at least 1/4 inch thick season with salt and pepper and a sprinkle of dried oregano a drizzle of good olive oil and possible a pinch of garlic
cover with cheese and bake till cheese melt 10-15 minutes. Serve with a good marinara sauce. And plenty of crusty bread to sop up the sauce
Cook with passion or don't cook at all