Preheat oven to 400.
In a medium skillet, heat the oil and butter over medium-high. Once the butter starts bubbling, add the onions. Saute until they start to soften, 5 minutes. Add the garlic, crushed red pepper and paprika. Saute another minute. Stir in the tomatoes, season with salt and pepper, and simmer 5 to 10 minutes.
Add in the cooked pasta and spinach. Stir to combine. Taste and adjust seasonings if needed.
Pour mixture into a baking dish, sprinkle with cheese and breadcrumbs.
Bake for 20 minutes. If the cheese isn’t melted and started to bubble and brown, flip it to the broiler for maybe a minute.
Go ahead and serve yourself two helpings. I mean, why not?
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