01 - Preheat the oven to 225°F. Line two large baking sheets with parchment paper to prevent sticking.
02 - Wash and thoroughly dry the zucchinis. Using a mandoline slicer or a sharp knife, carefully slice them into very thin rounds, approximately 1/8 inch thick, ensuring consistent thickness for even cooking.
03 - Place the sliced zucchini on paper towels and gently pat them dry to remove any excess moisture. This step is crucial for achieving crispy chips.
04 - In a large mixing bowl, combine the zucchini slices with olive oil, salt, black pepper, and any optional seasonings such as garlic powder or smoked paprika. Toss gently until all slices are evenly coated.
05 - Arrange the seasoned zucchini slices in a single layer on the prepared baking sheets. Ensure that the slices do not overlap, allowing them to crisp up properly.
06 - Bake for 1 hour. After this initial baking period, rotate the baking sheets for even cooking. Continue baking for an additional 30 to 45 minutes, or until the chips are visibly crisp and lightly golden.
07 - Carefully remove the baking sheets from the oven and allow the zucchini chips to cool completely on the trays. They will continue to crisp further as they cool down.
08 - Serve the crispy zucchini chips immediately for the best texture. If storing, place them in an airtight container at room temperature for up to 3 days.