Ballpark Popcorn Crunch

1/2 cup butter
1/2 cup brown sugar
3 quarts unsalted popped popcorn
1 cup chopped walnuts

Cream together butter and brown sugar till light and fluffy. In a separate bowl, toss popcorn and walnuts. Add creamed mixture to popcorn and nuts. Combine until coated. Spread on a large baking sheet in a single layer. Bake at 350-degree oven for 10 minutes or until crisp.