01 - Set the oven to 425°F and line a large baking sheet with parchment paper.
02 - In a large bowl, combine Brussels sprouts, olive oil, minced garlic, lemon zest, sea salt, black pepper, and red pepper flakes if using. Toss well to coat evenly.
03 - Spread the Brussels sprouts mixture evenly across the prepared baking sheet, then scatter the chopped beef bacon on top.
04 - Roast for 20 to 25 minutes, stirring once halfway through, until the Brussels sprouts develop a golden color and the beef bacon becomes crisp.
05 - Remove from the oven, drizzle with fresh lemon juice, toss gently, and serve while hot.