Preheat the oven to 425°F (210°C). Line two baking sheets with parchment paper.
Thinly slice the eggplant, zucchini, and onion. Mince the chiles. Combine the eggplant, zucchini, onion, chiles, ¼ cup (60 ml) of the oil, and 1 teaspoon of the salt in a l