Prepare the oven and preheat to 200 degrees C or 400 degrees F.
Apply cooking spray in a baking dish.
Put a large skillet on the stove and turn the heat to medium-high.
Add butter and let it melt.
Add the onions, then sauté for a few minutes until soft.
Turn the heat to medium-low, then add the garlic, pepper, and thyme. Sauté until aromatic.
Add the balsamic vinegar and beef broth, then stir until well blended. Make sure to scrape the bottom of the skillet to get the browned bits.
Simmer everything for 10 minutes or until the onions caramelize.
Add 1/3 of the mixture into the prepared baking dish and spread it evenly.
Lay the chicken breasts over the onion layer, then season with salt to taste.
Scatter the rest of the onions over the chicken.
Why your clean laundry may not smell as good as it should
Spiced Apple, Caramel, and Custard Traybake Recipe
How can you revive the colors of your clothes? Here are some tips
Sugar-Free Energy Snack Recipe
How Many Dolphins Are in the Picture?
My Wife’s Boss Loves Calling Her at 6 AM to Ask If She Can Cover Shifts for Sick Employees – We Taught Him a Perfect Lesson