Cut Brussels sprouts in half longways and set aside.

Chop onions and garlic as fine as you would like them. I chopped them as fine as possible.

Melt butter in large pan and add onions and garlic. Saute them until translucent.

Place Brussels sprouts flat side down in pan and cover with lid. Cook at medium/medium high until the bottoms start to brown. Flip them over and cook covered until they start to fall apart.