Step 1

In 12-inch nonstick skillet, melt butter over medium-high heat. Add chicken breasts; cook 3 to 5 minutes, turning once, until browned.

Step 2

In 3 1/2- to 4-quart slow cooker, place chicken breasts.

Step 3

In medium bowl, mix Alfredo sauce, sundried tomatoes, Parmesan cheese and Italian seasoning until well mixed. Pour over chicken breasts. Cover; cook on Low heat setting 3 to 4 hours or until chicken is no longer pink in center (165°F). Stir in spinach; cook 5 minutes longer. Serve over linguine, if desired.