Preheat oven to 350°F (176 °C) and place the rack in the middle of the oven.

Microwave the butter or coconut oil in a microwave-safe bowl big enough for the cashews. It only takes about 30 seconds to get it completely melted.

Once melted, add cashews and salt and toss until well coated.

Line a rimmed baking sheet with parchment paper. Place cashews on the baking sheet in a single layer and roast for 10 to 15 minutes, stirring after every 5 minutes.

Once golden brown, remove and let cool for at least 15 minutes.

Using a medium skillet over medium heat, melt the butter or coconut oil over medium heat.

Add the nuts and salt.

Roast the cashews until fragrant and brown, about 3-5 minutes, stirring frequently.

Remove cashews from the skillet, let them cool and use as desired.

Preheat the air fryer to 330°F (165 °C).

Microwave the butter or coconut oil in a microwave-safe bowl big enough for the cashews. It only takes about 30 seconds to get it completely melted.

Once melted, add cashews and salt and toss until well coated.

In a single layer (you might need to do a few batches depending on how big your air fryer is), place the cashews inside the air fryer, leaving room between each for even roasting.

Cook for 4 minutes, then toss them and cook an additional 3 to 5 minutes until they reach a golden brown.

Place cashews in a single layer on a microwave-safe plate.

Cook at full power in 1-minute intervals, stirring after every minute, until golden brown and toasted.