Preheat your oven to 225°F. Line two baking sheets with parchment paper.
In a large bowl, toss the zucchini slices with salt, black pepper, garlic powder, onion powder, and paprika. Let them sit for about 15 minutes to draw out moisture.
After 15 minutes, pat the zucchini slices dry with paper towels to remove excess moisture.
In a shallow dish, combine the breadcrumbs and Parmesan cheese. Dip each zucchini slice into the breadcrumb mixture, pressing gently to adhere.
Place the coated zucchini slices in a single layer on the prepared baking sheets. Drizzle with olive oil.
Bake in the preheated oven for 1 to 1.5 hours, flipping halfway through, until the chips are golden brown and crispy. Keep an eye on them to avoid burning.
While the zucchini chips are baking, prepare the Greek yogurt ranch dip. In a small bowl, mix together the Greek yogurt, ranch seasoning, lemon juice, dill, salt, and pepper until well combined.
Once the zucchini chips are done, remove them from the oven and let them cool slightly before serving with the ranch dip.