Sheet Pan Ratatouille

Name: Sheet Pan Ratatouille
Ingredients: 1 smallish eggplant, peeled; 1 bell pepper; 1/2 large yellow onion; 2 small zucchini or yellow squash, or 1 large; 1 pint grape tomatoes; 3 large cloves fresh garlic, peeled and roughly chopped; 1/2 teaspoon fresh thyme leaves, or 1/2 teaspoon dried; 1/8 cup extra-virgin olive oil; 3/4 teaspoon Kosher salt, plus more to taste; 12 turns freshly-ground pepper (about 1/2 teaspoon); 1 small handful fresh torn basil or parsley leaves, to garnish (optional)