Heat the Oven: Violently preheat your oven to exactly 400°F (200°C). Grab a large, heavy-duty rimmed metal baking sheet and line it completely flat with unbleached parchment paper.
Slice the Coins: Cut the tough stem ends off the washed vegetables. Use a sharp knife to slice the squash and zucchini into perfectly uniform, flat rounds that are exactly 1/3 of an inch thick.
Coat in Oil: Drop the raw slices into a massive mixing bowl. Pour the olive oil, garlic powder, dried oregano, coarse salt, and red pepper flakes over the top. Use your bare hands to gently toss until every piece is heavily coated.
Arrange Flat: Dump the oiled vegetables onto your lined baking sheet. Take the time to arrange them into a single, perfectly flat layer. Do not let the edges overlap at all, or they will aggressively steam.
Build the Crust: In a small dry bowl, toss your freshly grated parmesan, panko breadcrumbs, and fresh lemon zest together. Sprinkle a heavy pinch of this dry, cheesy mixture directly onto the flat top of every single vegetable round.
Roast and Broil: Roast undisturbed on the center rack for 10 to 12 minutes until the squash is perfectly tender. If the cheese isn't completely golden brown, violently blast the pan under the high broiler for exactly 1 to 2 minutes until perfectly crispy!