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Oven-Roasted Ratatouille

As summer and fall converge, celebrate the end and the beginning of the seasons with this rich and colorful assortment of vegetables that were meant to be together. All it takes is some chopping, time in the oven and an overnight stay in the fridge for this classic Italian staple to develop intense flavors and wow your family and friends. Enjoy hot over polenta, pasta or rice, serve at room temperature as an appetizer with crostini or use as a topping for your toast in the morning.

Course Appetizer, Main Course, Side Dish, Snack
Cuisine French
Keyword eggplant, onions, peppers, tomatoes, zucchini
Prep Time 20 minutes
Cook Time 1 hour 30 minutes
Overnight fridge 8 hours
Total Time 1 hour 50 minutes
Servings 6 side dish, appetizer and 4 entree
Author The Cowgirl Gourmet


  • 2 medium eggplants cut into 3/4" cubes
  • 3 medium zucchini and/or squash cut into 3/4" cubes
  • 4 medium heirloom tomatoes cut into 3/4" cubes
  • 2 colored bell peppers purple, yellow, red or orange
  • 2 small onions red and yellow, cut into 3/4" cubes or larger
  • 4 cloves garlic smashed and peeled and root tip removed
  • 4 sprigs fresh thyme
  • 2 springs fresh rosemary removed from the stem and chopped
  • 1/4 cup olive oil
  • 1 teaspoon kosher or sea salt
  • fresh basil when plating


  1. Preheat the oven to 425 degrees and line two baking sheets with parchment paper.

  2. Place all of the cut vegetables, garlic and herbs in a big bowl. Drizzle with 1/4 cup olive oil and toss well. Add the salt and toss again to combine.

  3. Cover baking sheets loosely with foil and bake for 45 minutes.

  4. Remove the foil, lower the temperature to 400 and let the vegetables cook 30 more minutes. Check on the vegetables during this 30 minutes, as you might find the vegetables are golden and cooked to your liking sooner.

  5. Remove from the oven and remove the thyme sprigs. Though you can eat it now, I prefer to let the ratatouille cool thoroughly and then refrigerate overnight, as the flavors will meld and get even better in the days to come.

  6. When ready to serve, you can heat it up in a skillet or serve at room temperature and top with fresh basil. Serve over polenta, pasta or rice or serve with crostini as a veggie-froward appetizer that everyone will love. Refrigerate any leftovers.