Prepare pasta shells according to package directions.
Meanwhile, drain chopped spinach well, pressing between paper towels.
Stir together spinach, chicken, basil, and next 4 ingredients. Spoon mixture evenly into shells.
Spread half of jarred Alfredo sauce in a lightly greased 13- x 9-inch baking dish. Arrange stuffed pasta shells over sauce, and pour remaining sauce over shells.
Bake, covered, at 350° for 40 to 45 minutes or until filling is hot and sauce is bubbly. Remove from oven, and let stand 10 minutes.
Note: To make ahead, prepare recipe as directed through Step Cover and freeze up to 1 month. Thaw in refrigerator 24 hours. Let stand at room temperature 30 minutes. Bake, covered, for 1 hour and 20 minutes.
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