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1
Preheat oven to 375 degrees F (190 degrees C). Grease a 9x13-inch baking pan with 1 tablespoon olive oil.
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2
Heat 1 tablespoon oil in a large skillet over medium heat. Cook beef, breaking apart into small pieces using a wooden spoon, until browned, about 5 minutes. Move to a bowl using a slotted spoon.
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3
Wipe the skillet clean with a paper towel. Heat the remaining 1 tablespoon oil. Add garlic and cook until fragrant, about 30 seconds. Add to the beef. Season beef with 1 teaspoon Italian seasoning, salt, and pepper. Stir in 1 1/2 cups marinara sauce until well combined.
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4
Cook and stir eggplant in the skillet until soft, about 2 minutes per side. Season with salt. Set on a plate. Repeat with zucchini. Cook and stir mushrooms over medium heat until soft, about 5 minutes. Transfer to a bowl. Cook and stir Cubanelle peppers until tender, about 3 minutes.
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5
Lay sweet potatoes evenly over the bottom of the baking pan, reserving a few slices. Layer eggplant, beef, zucchini, Cubanelle peppers, and mushrooms on top. Cover with the remaining 1/2 cup marinara. Top with the reserved sweet potato slices. Drizzle with oil; season with the remaining 1 teaspoon Italian seasoning, salt, and pepper. Cover with aluminum foil.
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6
Bake in the preheated oven until sweet potatoes are soft, about 45 minutes. Remove aluminum foil and bake until golden brown, about 15 minutes more. Let rest for 5 minutes before serving.