Slice the chicken breasts horizontally. you’ll need a sharp knife for this; it’s safer that way.The reason you cut the chicken breast into thin pieces is so that they can cook evenly during the pan-frying process. Thin pieces of chicken mean two things; 1. Faster cooking, and 2. A nice golden brown outside and tender, perfectly cooked inside.
Dredge. Season the chicken breast pieces, and then give them a nice coating of flour.
Fry. Fry the chicken cutlets in a combination of olive oil and butter. Cook 2-4 minutes per side, or until cooked through and golden brown on the outside. Remove and set aside.
Caramelize. In the same pan you cooked the chicken in, add 1 tablespoon of olive oil and 2 tablespoons of butter. Then add your sliced onions, ¼ teaspoons salt, 1 teaspoon of honey, chili flakes if using, and stir to combine. Heat over medium high heat for 5-7 minutes, then add the wine to deglaze the pan, give it a good stir, and let the wine evaporate. Kepe cooking until the onions start to turn a bit darker 4-5 minutes more. Then, sprinkle the flour over the top of the onions and stir again before adding the beef broth to cook for 12-15 minutes or until the onions are extremely tender and golden brown.
Turn the oven on to its broil setting.
Cheese. Add the chicken breasts back to the pan and nestle it in the onions and broth. Then, add a handful of grated gruyere cheese over the top of each breast.
Broil. Slide in the oven and broil for 3-4 minutes or until the cheese is melted, bubbly and starting to brown. Serve immediately!