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Preheat oven to 375°. Slice veggies between ¼ to ½ inch thick. Set aside. In a cast iron skillet over medium heat, brown onion slices in olive oil.
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Mix in tomato paste and garlic. Layer veggies in an alternating pattern, in the dish.
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Sprinkle veggies with garlic powder, smoked paprika, and pepper.
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Cover lightly with parchment paper. Bake for 35-45 minutes. Allow to slightly cool before serving.