Heat oven to 250°F. Line 15x10x1-inch baking pan with foil. In large skillet, combine brown sugar, cinnamon, sherry, corn syrup and butter. Bring to a boil over medium heat, stirring constantly. Stir in walnuts and cashews; cook and stir 4 to 7 minutes or until liquid is absorbed. Spread nuts in foil-lined pan.