Place the chopped eggplant, bell peppers, red onion, zucchini, and yellow squash on the baking sheet along with the whole garlic cloves still in their skins.
Drizzle the olive oil over the veggies, then season with crushed red pepper flakes, herbs de Provence, sea salt, and freshly cracked pepper to taste. Toss to coat evenly.
Roast for 15 minutes, tossing halfway through.
Add the tomatoes and continue roasting for 5-7 minutes, or until the veggies are tender and the tomatoes are about to burst.
Remove the garlic cloves from the baking sheet and let them cool for a couple of minutes.
Carefully remove the garlic clove skins, chop them up, and add them back to the veggies. Sprinkle the fresh parsley on top.
Serve this roasted ratatouille as a side dish or on top of your favorite pasta, eggs, or polenta. Enjoy.