Preheat oven to 250 F. Line a large rimmed baking sheet with a silicone mat or parchment paper.
Place the trimmed kale pieces in a large mixing bowl. Drizzle olive oil over the kale then massage with your hands until pieces are completely coated.
Sprinkle salt and garlic powder over the kale and toss lightly to coat.
Arrange the kale pieces in a single layer on the baking sheet.
Bake for 25-30 minutes until the kale pieces have dried out and are crispy, but not browned.
Remove baking sheet from the oven and pour kale chips into a serving bowl. Sprinkle additional truffle salt on top, if desired.
Serve immediately or store in an airtight container for 3-5 days.