Bring a medium sized pot of water to a boil and boil broccoli for about 3 minutes. Be careful to not over-boil or broccoli may become a little mushy!
Remove the broccoli from water and place in an ice bath or run under cold water.
Add the broccoli florets to a large bowl and toss gently with olive oil, minced garlic, lemon juice, salt, and pepper.
Line a sheet pan with parchment paper or a silicone baking mat, and arrange broccoli on the pan in an even layer.
Use a thick cup or bowl with a flat bottom to "smash" each piece of broccoli until it's thin and flat. *If using glass, do this very carefully so that you don't break the glass in your hand, or use plastic to be safer!
Add a final sprinkle of parmesan cheese to each piece of broccoli and bake for about 15 minutes until broccoli is browned and crispy. If you want even crispier broccoli, broil on low for 1-2 additional minutes.