PREHEAT oven to 300° F. Grease large roasting pan. Line serving plate with wax paper.
COMBINE popcorn and nuts in prepared roasting pan. Combine morsels, corn syrup and butter in medium, heavy-duty saucepan. Cook over medium heat, stirring constantly, until mixture boils. Pour over popcorn; toss well to coat.
BAKE, stirring frequently, for 30 to 40 minutes. Cool slightly in pan; remove to prepared serving plate. Store in airtight container for up to two weeks.