On a large baking sheet with parchment paper, place cauliflower, oil and onions, sprinkle with the salt and pepper. In another baking dish, add tomatoes, salt, oil, pepper, dried basil and oregano. Roast both trays/dish at 400 degrees F for 15 min.
Add chickpeas to cauliflower tray, toss, bake until cauli is fork tender.
After the first 15 min, check tomatoes. If they're bursting, remove from oven. If not, cook another few minutes.
Meanwhile, make marinara sauce. In medium saucepan over medium heat, add oil and onions, cook until translucent. Add garlic, cook another minute.
Add remaining ingredients, simmer gently for 10 min.
Combine vegetables with sauce and serve as is, or with your favorite starch or salad.
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