Add the oil to a large skillet and heat to medium. Add the brussel sprouts and try to get them in a single-layer cut-side down (it’s not a big deal if they aren’t all cut-side down, but you can get a nice golden sear on them for added flavor). Cover and cook, untouched for 5 minutes. Remove the cover, stir, cover again and cook another 2 to 3 minutes.

Sprinkle garlic on top (don’t stir just yet), cover the skillet again and cook 3 minutes.

Stir well to combine everything together and continue cooking, stirring occasionally (without the cover) until garlic is very fragrant and brussel sprouts reach desired done-ness.

Stir in the butter until melted. Taste for flavor and add sea salt and/or red pepper flakes to taste. Serve alongside your main entree.