Trim the ends of the Brussels sprouts and remove any loose outer leaves
Rinse and dry the Brussels sprouts thoroughly
Cut the Brussels sprouts in half lengthwise
Heat a skillet over medium-high heat
Add oil or butter to the skillet
Place the Brussels sprouts cut-side down in a single layer
Cook without stirring for 4 to 5 minutes until browned
Flip the Brussels sprouts and cook for another 3 to 5 minutes
Add salt and pepper to taste
Add minced garlic, if desired, during the last 1 minute of cooking
Add a splash of water and cover briefly if the sprouts need to soften more
Remove from heat when tender and caramelized
Serve immediately