Lightly sprinkle chicken breasts with salt, pepper, and paprika.

Place chicken breasts in the slow cooker.

In a mixing bowl, combine the white wine, condensed cream of mushroom soup, and drained sliced mushrooms.

In a separate bowl, mix together sour cream and all-purpose flour.

Stir the sour cream mixture into the mushroom and wine mixture.

Pour the combined sauce over the chicken in the slow cooker.

Sprinkle with additional paprika, if desired.

Cover the slow cooker and cook on Low for 6 to 8 hours, or until chicken is cooked through.