Preheat oven to 325°F (163°C) and line a baking sheet with parchment paper.
In a bowl, mix sourdough discard, honey or maple syrup, oil, vanilla, and brown sugar until smooth.
Add oats, nuts, seeds, cinnamon, and salt. Stir until everything is evenly coated.
Let the mixture sit for 5 minutes to absorb moisture.
Spread the mixture evenly on the baking sheet and press down firmly.
Bake for 35 to 45 minutes until golden brown, rotating the pan halfway through.
Remove from oven and let cool completely without stirring.
Break into clusters and mix in dried fruit.
Store in an airtight container at room temperature.