Oklahoma Fried Onion Burgers


1/4 teaspoon canola oil

5 ounces freshly ground beef, divided into two 2 1/2-ounce balls

Kosher salt and freshly ground black pepper

1 medium onion, thinly sliced (about 1 cup sliced onions)

2 slices American cheese

2 soft hamburger buns

Mustard, pickles, and other condiments, if desired