Preheat oven to 450 degrees F. Line baking sheet with foil. Cut off the ends of your brussels, slice in half lengthwise, rinse, lay on paper towels to remove moisture from the outsides. Put into a bowl.
Drizzle with olive oil and add seasonings. Toss to coat. Pour on to your baking sheet with cut side facing down and not overlapping.
Bake for 10-12 minutes flipping over halfway thru. Timing will vary depending on how large they are, remove once fork tender to your liking. Sprinkle on parmesan at end if desired, squeeze fresh lemon juice on when served.