Slice the zucchini into rounds and wash and dry the slices.

Set up a breading station with one bowl of flour, one bowl with frothy egg whites, and one bowl with a mix of breadcrumbs, garlic powder, kosher salt, and black pepper.

Dredge each zucchini slice in the flour, then dip it in the egg whites, and finally coat it with the breadcrumb mixture.

Heat vegetable oil in a frying pan over medium heat.

Fry the breaded zucchini slices until golden brown. Drain them on paper towels.

Preheat the oven to 375°F (190°C).

In a casserole dish, spread some marinara sauce on the bottom.

Layer half of the fried zucchini slices, then half of the marinara sauce, and half of the mozzarella cheese.

Repeat the layers with the remaining fried zucchini, marinara sauce, and mozzarella cheese.

Sprinkle grated Parmesan cheese on top.

Bake in the preheated oven for about 25-30 minutes or until bubbly and golden.

Let it cool for a few minutes before serving.