Golden Onion Smash Burgers
๐๐๐๐โ๐๐๐ ๐น๐๐๐๐ ๐๐๐๐๐ ๐ต๐ข๐๐๐๐๐ ๐๐ป๐ด๐ฟ๐ฒ๐ฑ๐ถ๐ฒ๐ป๐๐: 1 lb ground beef ๐ฅฉ 1 large onion, thinly sliced ๐ง 4 burger buns ๐ 4 slices of American cheese ๐ง 2 tbsp butter ๐ง โฆ