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Cook pasta according to package directions until al dente. Drain pasta, reserving about 1/2 cup of pasta water.
While pasta is cooking, heat a small skillet over medium-high heat. Add sun-dried tomatoes with their oil to the pan and stir for about 2 minutes. Add the onions and sauté 2 to 3 minutes until translucent. Add garlic and stir 30 seconds until fragrant. Add roasted peppers and stir together for 2 minutes more. Add chopped rosemary (if using) and stir another 30 seconds. Remove from heat.
Transfer pepper tomato mixture to the bowl of a food processor, add chickpeas and ricotta cheese and puree until mostly smooth. (There may be a few chunks of pepper and tomato.)
Drizzle a bit of olive oil in bottom of pasta pot and return drained pasta to pot over a low flame; toss to coat with oil. Toss pasta with sauce, adding reserved pasta water if necessary to thin out the sauce. Serve hot.
National Pasta Association Recipe