Zucchini, Squash, Onion & Cheese Casserole

to 3 tablespoons olive oil (plus tiny bit more for drizzling at the end)

medium onion, sliced thin

garlic, finely diced

medium zucchini, ends cut off and thinly sliced into circles

medium summer squash, ends cut off and thinly sliced into circles

freshly grated nutmeg

white cheddar cheese, shredded

Rosemary Asiago Cheese (or other cheese of choice)

to ¼ cup panko crumbs

Grated Parmesan for dusting on top

Salt and pepper

Fresh chopped Italian Parsley for garnish (optional)