single layer.
In the same skillet, reduce the heat to medium. Add the sliced onion and cook, stirring often, until softened and starting to turn golden around the edges, about 5–7 minutes. If using minced garlic, stir it in during the last minute so it doesn’t burn.
Sprinkle the reserved 1 tablespoon of flour over the onions and stir well, cooking for about 1 minute to get rid of the raw flour taste. This will help thicken the gravy later.
Slowly pour in the cola, stirring and scraping up any
