Good-Cooking - Butterscotch Rum Pound Cake

Ingredients

• 1 2/3 cup (11 ounce package) butterscotch-flavor chips, divided
• 1 (18.25 ounce) box yellow cake mix
• 4 large eggs
• 3/4 cup sour cream
• 1/2 cup milk
• 1/2 cup dark rum
• 1/4 cup (1/2 stick) butter or margarine, softened
• 1 cup finely chopped walnuts or pecans