Cook noodles in boiling water 1 minute. Add carrots and shrimp; cook 2 minutes or until shrimp are done. Drain in a colander over a bowl, reserving cooking liquid. Rinse noodle mixture under cold water; drain. Add noodle mixture, bell pepper, and 1/4 cup onions to peanut butter mixture, tossing to combine. Add enough of reserved cooking liquid to keep sauce creamy. Sprinkle with remaining 1/4 cup onion and peanuts.
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