Place a rack in the center of your oven and preheat the oven to 375°F.
Heat the olive oil in a large, ovenproof, nonstick skillet over medium-high. Add the onion and cook, stirring often, until the onion is translucent, about 3 minutes. Add the garlic and cook just until fragrant, about 30 seconds.
Stir in the chickpeas, tomato sauce, oregano, salt, and red pepper flakes. Bring to a simmer and let cook until slightly thickened, about 3 minutes.
Stir in the spinach a few handfuls at a time, letting it wilt.
With the back of a spoon, make 4 indentations in the sauce. Crack one egg inside of each, then sprinkle the Parmesan cheese over the whole dish.
Carefully transfer the pan to the oven. Bake until the egg whites are set but the yolks are still soft, 10 to 12 minutes. Remove from the oven and sprinkle with fresh basil. Serve hot with baguette slices.
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