Preheat oven to 325 degrees. Line a large baking sheet with parchment paper or spray with non-stick spray (you can do neither but some of the oats will stick to the bottom). Stir together oil, honey, sugar, vanilla, cinnamon, and salt. Pour over oatmeal and stir to coat. Stir in the nuts if desired (I did because I wanted the walnuts to be toasted). Spread mixture onto baking sheet. Bake for 20-30 minutes, stirring every 5 minutes until golden brown.
Let cool completely. Stir in fruit (and nuts if you didn’t add them prior to baking). Transfer to an air tight container.