Preheat oven to 400 degrees Fahrenheit. Trim ends of Brussels sprouts and cut in half, lengthwise. Discard any leaves that are discolored or limp. Cut bacon into 1" pieces.
Directly on a sheet pan, gently toss Brussels sprouts with bacon, avocado oil, salt and pepper and dried ranch seasoning (if using).
Roast until sprouts are desired tenderness, approximately 20 minutes. Bacon should be well cooked and crispy.
Remove from oven, add parmesan cheese and toss to combine. Return back to oven and broil on 2 minutes on low.
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