Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper.
Cut the head of broccoli into medium florets, keeping some of the tender stems attached. Trim tough spots on the broccoli stem with a vegetable peeler if needed.
Add the broccoli to a large bowl and drizzle with olive oil. Toss to coat well, adding more if necessary—every floret should look “wet.”
Sprinkle with MSG, salt, pepper, and SPG. Toss again so the seasoning sticks evenly to all sides.
Spread the broccoli in an even layer on the baking sheet, arranging the flat sides down.
Roast broccoli for about 20 minutes, or until the undersides are golden brown and the tender florets are just crisp at the edges.
Remove from the oven and, if desired, top with parmesan cheese and a pinch of red pepper flakes.
Notes
Air Fryer Instructions: Set it to 400°F, cook for 10–12 minutes, and shake once halfway through.
Storage Instructions: Keep them in an airtight container for up to 3 days. Reheat in a hot oven or air fryer for crispy edges again.