1. In 2-quart saucepan, melt butter over medium-high heat and cook mushrooms, stirring occasionally, 2 minutes or until mushrooms are tender. With wire whisk, stir in water and Lawry's ® Turkey Gravy Mix. Bring to a boil over high heat. Reduce heat to low and simmer, stirring occasionally, 1 minute. Remove from heat and let cool 2 minutes.
2. Stir in sour cream.