Preheat oven to 375F.
In a large non-stick skillet add olive oil and sauté onions and garlic 2-3 minutes.
Add 1 tsp salt, black pepper, tomato sauce, red pepper flakes if using, bay leaf, thyme, basil, red and yellow bell pepper; sauté another 5-8 minutes on medium-low heat.
In a large nonstick grill pan, grill the zucchini and eggplant 2 to 3 minutes on each side.
Add 1 cup of the sauce to a casserole dish. Layer the eggplant, squash and the zucchini. Pour the remaining sauce over the top and top with the cheese. Cover with foil and bake 40 minutes.
Serving: 1slice, Calories: 185kcal, Carbohydrates: 22g, Protein: 11g, Fat: 7g, Saturated Fat: 2.8g, Cholesterol: 11mg, Sodium: 689mg, Fiber: 7g, Sugar: 5g
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