"All you need for this outrageously tasty dinner is a bag of onions, a couple cloves of garlic, some dried pasta, and cheese...."
INGREDIENTS
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2 Tbsp. extra-virgin olive oil
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2 Tbsp. unsalted butter
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2 lb. onions (about 3 large), thinly sliced
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2 garlic cloves, thinly sliced
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1/4 tsp. crushed red pepper flakes (optional)
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1 1/2 tsp. kosher salt, plus more
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12 oz. linguine or other long pasta
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4 oz. Parmesan, finely grated (about 1 cup), divided, plus more for serving
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½ cup parsley, finely chopped (optional), plus more for serving
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Freshly ground black pepper