Bring a pot of water to a boil. Trim the ends off the brussels sprouts and boil the brussels sprouts for 20 minutes. Transfer to a bowl of ice water to cool
Preheat the oven to 425 F
Drain the water and pat the brussels sprouts dry. Grease a pan with olive oil and transfer the brussels sprouts onto the pan
Using a thick glass jar, smash each once flat. *Make sure you use a sturdy cup or jar
Spray the brussels generously with olive oil spray and season with the salt, pepper and garlic powder
Roast for about 30 minutes, flipping halfway through. You can also air-fry on 375 F for 18-20 minutes
Serve with flakey salt and your go-to dipping sauce