Gently peel the outer leaves of the brussel sprouts without tearing them. Reserve the center of the sprouts for other uses.
Drizzle a tiny bit of olive oil on top of a large cookie sheet. Sprinkle with a small pinch of sea salt and pepper flakes.
Place the brussel leaves on top cookie sheet and using your hands gently toss them to coat in the olive oil very lightly.
Spread them around preferably without touching each other or overlapping.
Bake them in the preheated oven for about 5 to 8 minutes until they start turning golden brown. Check often making sure not to burn them. Shake the cookie sheet once or twice midway.
Serve the Brussel sprout chips hot with grated parmesan cheese on top or a squeeze of lemon juice.