Instructions:
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Preheat and Prepare: Crank up your oven to 400°F and mist a baking dish with a cooking spray.
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Sauté the Onions: In a large skillet, melt butter over medium to high heat. Add your sliced onions, sautéing for approximately 5 minutes; stir them now and then.
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Infuse Flavors: Lower the skillet heat to medium and toss in garlic, pepper, and thyme. Stir and cook for an additional minute.
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Turn Onions into Jam: Pour in the beef broth along with the balsamic vinegar. Continue cooking until the onions adopt a jammy texture, around 10 minutes.
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Assemble the Dish: Lay a third of your caramelized onions into the prepped baking dish. Situate the chicken breasts on top and season with a sprinkling of salt.
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Cheese It Up: Pile on the remaining caramelized onions over the chicken and smother with mozzarella and Parmesan cheese.
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Bake to Perfection: Slide the dish into the oven and bake for 30 minutes or until the chicken reaches an internal temperature of 165°F.
Notes:
For uniformly cooked chicken, ensure all breasts are roughly the same size. If they’re too thick, halve them diagonally.Feel free to amp up the seasoning to suit your palate.
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