Preheat oven to 250°F. Mix cereals, pretzels and nuts on a large, ungreased rimmed sheet tray.
Melt butter with ANGOSTURA® aromatic bitters in a small glass measuring cup in the microwave. Stir in remaining ingredients until salt is dissolved. Drizzle over cereals, gently stirring to coat as much as possible.
Bake about 40 minutes or until mixture is crunchy. Transfer hot mix to another tray or piece of foil to cool completely. Store cooled mix in an airtight container until ready to eat.