Preheat a cast-iron pan over medium-high heat and add a generous coating of olive oil
Add the broccoli to the pan, arrange cut sides down, season with salt, and let cook until undersides are dark brown and florets are bright green
Toss the broccoli and let cook a few minutes longer until stems are crisp-tender
Crumble cheddar cheese over the broccoli and let melt, creating crispy cheese sheets
Sprinkle with crushed red pepper flakes, serve with lemon wedges, and enjoy
