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© Meredith Corporation. All rights reserved. Used with permission.
(4 servings, about 1 1/4 cups each)
Position a rack in upper third of oven; preheat broiler. Coat a 2-quart broiler-safe baking dish with cooking spray.
Cook noodles in a large pot of boiling water until just tender, 7 to 9 minutes. Drain; set aside.
Meanwhile, prick sweet potato with a fork in several places. Microwave on High until tender all the way to the center, 7 to 10 minutes.
Whisk milk, flour and garlic in a large saucepan. Heat over medium heat, whisking frequently, until steaming and hot, but not boiling. Remove from heat.
As soon as the sweet potato is cool enough to handle, cut open and scoop the flesh into the steaming milk. Puree with an immersion blender until smooth. (Alternatively, transfer to a blender and puree just until smooth, then return to the pot; use caution when pureeing hot liquids.)
Add cheese, mustard, salt and pepper and stir until the cheese melts. Add the pasta and peas to the sauce and stir to coat. Transfer to the prepared baking dish. Combine breadcrumbs and oil and sprinkle on the pasta. Broil on the upper rack until the top is lightly browned and crispy, 1 to 2 minutes.