Pre heat oven to 400 degrees. Start by trimming and cleaning the brussels sprouts. Remove hard ends and any brown leaves and disgard.
Using either a mandoline or a super sharp knife, shave or cut the brussels sprouts as thin as possible.
Peal the skins off of the pearl onions and discard.
Using a sharp knife, cut the onions in half then slice as thin as possible. I do not recommend using a mandoline for the onions.
Place bacon on a baking sheet and bake in the oven for 12 to 15 minutes or until crispy. Chop bacon up small and set aside.
Mix all ingredients into a bowl except the bacon and toss well until everyrhing is well combined.
Place brussels sprout mixture into your air fryer at 400 degrees. Cook for 30 mins or until brussels sprouts are crisp.
Mix the bacon in ans cook for another 5 minutes. Serve immediately and enjoy!