Preheat oven to 400. Line a rimmed baking sheet with aluminum foil or parchment paper
Toss the squash with olive oil and salt and pepper and on baking sheet in a single layer. Spoon the marinara sauce over the squash.
Bake for about 15-18 minutes. Sprinkle with the mozzarella cheese and then the Parmesan cheese. Bake for an addition 5-7 minutes or until squash is tender and cheese is melted and starting to brown.
While the squash bakes, prepare the breadcrumbs. Heat the oil and garlic in a small skillet over medium heat. When the garlic is fragrant (about 2 to 3 minutes) add the breadcrumbs, oregano and salt and pepper. Stir, tossing the crumbs in the garlic until browned and toasted, about 8-10 minutes.
Serve the squash with the breadcrumbs sprinkled on top.