Chicken with Mushroom Gravy

2 lbs boneless skinless chicken breast
1 tsp salt
1/4 tsp pepper
1 1/2 cups mushrooms, sliced
1/4 cup chicken broth
1 10.75 oz can cream of mushroom soup
1 cup sour cream
1/4 cup flour

Place chicken in slow cooker. Sprinkle with salt and pepper. Add mushrooms. Mix broth and soup . Pour over chicken. Cover and cook on Low 7 to 9 hours or High 3 to 4 hours. Remove chicken from slow cooker and allow to cool. (Shred the chicken or leave it in pieces.) Stir together flour and sour cream. Stir into sauce. Allow to cool. Place chicken and sauce in freezer bag. Label and freeze.

To serve: Thaw. Heat and stir until smooth, thick and bubbly.