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Heat the oil in a large skillet over medium high heat. Sauté the onions until soft, about 7 minutes. Add the garlic, and sauté until fragrant, about 2 more minutes. Add the roasted peppers and sauté until heated through. Remove from heat, and let cool slightly.
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Place the mixture in the bowl of a food processor with broth and all but 2 tablespoons of the feta. Process until combined and smooth. Alternatively, place the mixture in a large bowl, and puree using an immersion blender (this is what I did since my food processor is tiny.) Add salt and pepper to taste. This recipe needs lots of salt, so don’t be afraid to keep adding more!
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Cook the pasta according to package directors. Drain, reserving ½ cup pasta water. Toss the pasta and sauce, and add pasta water by the tablespoon, if needed. Add additional salt and pepper, to taste.
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Sprinkle with parsley and remaining feta cheese before serving.