Peanut Butter Party Mix

1 cup peanut butter
2 teaspoons cinnamon
1 lb margarine
1 cup sugar
1 box Crispex
1 box Cheerios
1 box corn bran
1 package small pretzels
Unsalted peanuts

Melt peanut butter, cinnamon, sugar and margarine; pour over combined remaining ingredients. Bake at 275° for 1 hour. Mix every 15 minutes so cereals absorb all of the syrup. Cool on paper towels.