Preheat oven to 375 degrees. Using a mandoline or knife, slice Brussels sprouts into 1/4-inch slivers. Toss with onions, olive oil, and salt and pepper. Spread out on a foil-lined baking sheet and place in oven for 20-30 minutes. Sprouts will be shredded pieces of various sizes.

While Brussels sprouts bake, chop bacon strips into 1/4 inch pieces and fry at high heat until crispy. When Brussels sprouts and onions are browned and crispy, remove from oven and toss with bacon bits. Sieve hard-boiled egg on top of mixture using a metal strainer or garlic rocker.