Instructions: Preheat oven to 350. Cook pasta according to package directions. Reserve 1/2 cup pastawater; drain. In food processor, combine basil, roasted red pepperx and garlic; process until finely chopped. With machine running, pour 1/4 cup oil through feed tube until combined. Add nuts and 1/4 cup cheese; process until finely chopped. Stir in reserved 1/2 cup pasta water.

Heat remaining 1 tablespoon oil in skillet over medium-high heat. Add chicken; cook stirring occasionally, 5 minutes. Stir in 1 cup pesto sauce and remaining 1/4 cup cheese. Remove from heat. Spoon remaining pesto sauce into 13 x 9 inch baking dish. Stuff shells with chicken mixture. Place on sauce in dish. Cover and bake 30 minutes until heated.

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