Combine first 5 ingredients in a medium bowl, stirring well. Whisk together oil, vanilla, and salt in a small bowl until blended. Pour over oat mixture, stirring until evenly moistened. Spread oat mixture in a 15- x 10-inch jellyroll pan lined with aluminum foil. Bake at 350° for 12 minutes, stirring after 10 minutes. Cool completely in pan. Stir well, and store in an airtight container.