Heat a medium non-stick skillet over medium heat, and add the walnuts, brown sugar, salt, optional spices, and vegan butter.
Stir frequently so the walnuts and sugar don't burn (pay special attention at the last minute). When the sugar mixture starts melting, constantly stir until the brown sugar is completely melted and the walnuts are fully coated.
Transfer immediately onto a sheet of parchment paper and immediately separate the nuts; otherwise, they will stick together.
Once the coating hardens, which will take about 5 minutes, you can transfer them to a bowl and enjoy!
Air-fryer
Melt the vegan butter and mix the nuts with the rest of the ingredients, and spread them separately on the baking rack. Bake at 350 ºF (176 ºC) for 13 minutes.
Oven-baked
Melt the vegan butter, mix the nuts with the rest of the ingredients, and spread them on a prepared baking sheet with parchment paper. Bake at 350 ºF (176 ºC) for 12-15 minutes.
Video
Notes
You can store candied walnuts in an airtight container for up to 3 days at room temperature.If you plan to keep them for longer, you can store them in the fridge for up to 2 weeks or in the freezer for up to 2 months.