Sheet Pan Ratatouille

Name: Sheet Pan Ratatouille
Ingredients: Nonstick cooking spray; 1 large (about 1 1/2 pounds ) eggplant , trimmed and cut into 1-inch chunks; 2 medium summer squash (1 yellow and 1 zucchini), cut into 1-inch chunks; 1 red bell pepper , cored and cut into 1-inch chunks; 1 medium sweet onion , cut into 1-inch chunks; 6 cloves garlic , finely chopped; 1/2 teaspoon Aleppo pepper or crushed red pepper flakes; 2 cups grape or cherry tomatoes , halved; 2 tablespoons chopped fresh basil , parsley, or chives; 1/2 teaspoon freshly ground black pepper , plus more to taste; 3/4 teaspoon kosher salt , plus more to taste; Extra-virgin olive oil , for serving