Preheat oven to 350 F degrees. In a medium bowl, combine dry ingredients (oats through salt). Add in oil; mix until well combined. Next add in maple syrup and vanilla; mix until oil, syrup and vanilla well-incorporated. Pour mixture onto parchment-lined baking sheet.
Bake for 20-25 minutes. Let cool completely, then break apart. Add optional add-in ingredients, if desired. Keeps in airtight container for up to 1 week.