Preheat oven to 400℉.
Using a sharp knife, slice the tops of the Brussels Sprouts to make a flat edge.
Carefully using a mandolin, slice the Brussels Sprouts 3/16" thick. Throw away stems.
In a large bowl, combine shaved Brussels Sprouts, olive oil, salt + pepper, and garlic. Using your hands or tongs, toss to mix well evenly.
On a large baking sheet, layer Brussels Sprouts and bake for 16-18 minutes. At 7 minutes, remove from oven and toss with tongs.
Top with balsamic glaze if desired.
Enjoy!