Cut all of the onions. To do this, cut both ends off of each onion, cut the onion in half, cut the onion in half again, and then thinly slice the onion.
Season both sides of the chicken tenders with salt and pepper.
Add the butter to a large skillet on the stove over medium-low heat. Then, add the sliced onions, salt, pepper, garlic, oregano, and thyme to the skillet.
Cook the onions in the skillet until they are browned and caramelized. It will take about 20-25 minutes to caramelize the onions. Move the onions around occasionally while they are caramelizing.
Once caramelized, move the onions to one side of the skillet and add in chicken tenders. Brown the chicken tenders in the skillet for 3-3 ½ minutes on each side over medium heat.
Pour the balsamic glaze into the pan, this will deglaze the pan. Scrape off any bits that are stuck to the pan and mix. Next, add the beef broth to the skillet. Also, add the bay leaf. Let everything simmer for 5-7 minutes, or until the chicken is fully cooked, when it reaches an internal temperature of 165℉.
Once the chicken is cooked, remove the bay leaf. Then, sprinkle the cheese on top. Put the lid on the skillet to melt the cheese. Enjoy!