Start by washing the zucchinis thoroughly. Slice them into thin rounds, about 1/8 inch thick using a sharp knife or mandoline slicer for even thickness.
In one shallow bowl, beat the two large eggs until well combined. In a second bowl, mix together the grated Parmesan cheese, breadcrumbs, garlic powder, onion powder, salt, and pepper.
Dip each zucchini slice into the beaten eggs, allowing any excess to drip off, then dredge it thoroughly in the Parmesan-breadcrumb mixture, pressing lightly to ensure it sticks. Place each coated slice on the prepared baking sheet lined with parchment paper or a silicone mat. Optionally, place slices on a wire rack over the baking sheet for extra crispiness.
Lightly spray the tops of the coated zucchini chips with olive oil spray to help them brown and crisp.
Preheat your oven to 425°F (220°C). Bake the zucchini chips for 20-25 minutes, turning them halfway through to crisp evenly. Bake until golden brown and crispy.
Let the chips cool for a few minutes on the baking sheet to set their crisp texture. Serve as a snack, appetizer, or alongside a fresh salad.