Combine first 3 ingredients in a large zip-top heavy-duty plastic bag; set aside. Combine butter and remaining ingredients in a small bowl; add mixture in bag. Seal the bag and shake to coat.
Spread mixture evenly into a 15- x 10- x 1-inch jellyroll pan. Bake at 275 degrees for 30 minutes, stirring twice. Cool completely; store in an airtight container.