Prepare the onions. Cut the onions in half and slice the halves.
Mince two garlic cloves and set aside.
Heat 1 tbsp of olive oil in a Dutch oven over medium-high heat.
Add the onions and lightly salt. Cook for 3-4 minutes, stirring occasionally.
Lower to medium heat and continue to sauté the onions, stirring from time-to-time. If you find they are browning too quickly, reduce to low heat. Continue cooking until the onions are very soft and jammy, about 45 minutes.
In the last fifteen minutes before the onions are ready, prepare the chicken by heating 1 tbsp of olive oil in a large skillet.
Pat the chicken dry and lightly salt and pepper both sides.
Carefully add the chicken to the oil and cook until both sides are golden brown, about 5-7 minutes per side. Start with the "skin" side, then flip. Remove to a platter.
Add the garlic to the onions and cook for 1 minute.
Sprinkle the thyme over the onions and garlic and cook until fragrant, about 1 minute.
Pour the beef broth and red wine over the onions, bringing to a simmer.
Place the chicken in the pot with the onions and broth and cook at a simmer for 25-30 minutes, until the internal temperature, taken with an instant read thermometer inserted into the thickest part of the meat, reads 165 degrees F.
Prepare a package of egg noodles according to package directions while the chicken cooks.
Drain the pasta when ready and add it to the French onion chicken, tossing to combine.
Sprinkle shredded Gruyère evenly over the chicken, pasta, and broth. Let the cheese melt before serving. I also like to serve the dish with extra cheese on the side.