Preheat oven to 375 degrees F.

In large bowl, whisk aquafaba until slightly thickened and foamy. Add cashews and toss to coat. Add coconut sugar and vanilla extract, stir to evenly combine and coat all cashews. Spread cashews out on parchment-lined baking tray in single layer. Bake for 12-15 minutes, mixing halfway.

Remove from oven and top with flaky salt. Let cool for about 30 minutes. Store in airtight container for up to one week at room temperature.