Heat Things Up: Preheat your oven to a toasty 425°F (218°C).
Boil 'Em Tender: Fill a large pot with water, add 2 teaspoons of sea salt, and bring it to a rolling boil. Carefully drop in your Brussels sprouts and let them simmer for about 8-10 minutes. They should be tender enough for a knife to slide in easily, but not mushy. Quickly drain them, rinse under cold water, and pat them really dry with paper towels – this helps them get extra crispy!
Season & Toss: In a big bowl, drizzle the boiled sprouts with olive oil. Sprinkle in the garlic powder, the remaining 1/2 teaspoon of sea salt, and cayenne pepper. Give them a good toss to coat evenly. Now, add 5 tablespoons of the Parmesan cheese and toss again until every sprout is happy.
Smash Time: Lightly grease a large baking sheet with oil or cooking spray. Arrange your seasoned sprouts in a single layer, making sure they have some room to breathe (about 1.5-2 inches apart). Grab the bottom of a sturdy glass or mason jar and gently but firmly press down on each sprout to flatten it. Fun, right?
Cheesy Topping (Optional): If you're using it, sprinkle the remaining 3 tablespoons of grated Parmesan cheese right over your smashed sprouts. This creates an extra golden crust!
Roast to Perfection: Pop the baking sheet into your preheated oven. Roast for 25-30 minutes, making sure to flip them halfway through so both sides get beautifully golden and super crispy. Keep an eye on them – you want them browned, not burnt! Serve hot and enjoy your healthy, crunchy side!