Healthy Zucchini, Tomato & Yellow Squash Gratin Recipe

large zucchini, cut into 1/2-inch slices

medium yellow squash, cut into 1/2-inch slices

olive oil

tomatoes, cut into 1/2-inch slices

+ 2 tbsp grated Parmesan cheese, divided

salt

ground pepper

large basil leaves, thinly sliced

panko breadcrumbs