Preheat your oven to 225°F (110°C) and line a baking sheet with parchment paper.
Slice the zucchinis thinly—about 1/8 inch works best for crisp chips.
Pat slices dry with a paper towel to remove moisture.
In a bowl, toss zucchini slices with olive oil, garlic powder, smoked paprika, salt, and pepper.
Spread slices in a single layer on the baking sheet. Don’t overlap.
Bake for 1.5 to 2 hours, flipping halfway through, until crisp and golden.
Let them cool slightly before serving (they crisp up more as they cool).