1. Preheat the oven to 300F and line a baking pan with parchment paper. Then, remove the kale leaves from their stems with a knife or kitchen shears, and cut the leaves into bite sizes (you can save the stems to make vegetable stock).
2. Wash the kale leaves and dry thoroughly with a salad spinner or paper towels. Then drizzle with olive oil and toss the leaves to combine. You can also massage the oil onto the leaves so it reaches all surfaces.
3. Arrange the oiled kale leaves on the lined baking pan, ensuring they stay in one layer and don’t overlap. Then, season with salt and slide the pan into the preheated oven.
4. Bake the kale for 20 to 30 minutes or until the leaves start to turn brown at the edges and serve at once for the best results.

You can also view this video recipe for more help.