Preheat your oven to 375 degrees. Line a small rimmed baking sheet with parchment paper.
Make the lemon garlic aioli by combining the mayonnaise, lemon juice, and lemon zest in a small glass jar and stirring until well mixed; set aside to allow the flavors time to mingle.
Blanch the broccoli by bringing a large saucepan of well-salted water (halfway full) to a boil. Add the large florets and blanch the broccoli for 1-2 minutes, strain, and transfer to a plate lined with a clean dish towel or a few paper towels; dry well.
Sprinkle the prepared small baking sheet evenly with parmesan cheese in a thin, even layer.
Next, transfer the broccoli on top of the cheese, slightly spacing them out so there is room to mash them.
Take the bottom of a small glass jar and smash the broccoli pieces down firmly.
Season the broccoli tops with crushed red pepper flakes, garlic powder, onion powder, sea salt, and freshly cracked black pepper. to taste.
Bake the cheesy broccoli by placing the baking sheet in the oven for 20-25 minutes or until the cheese has turned golden brown and the broccoli is turning crispy.
Remove from the oven, allow it to cool slightly, then break apart and serve immediately with the lemon garlic aioli on the side. Enjoy.