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.
Sprinkle a generous amount of Parmesan and mozzarella cheese on top of the onions.
Place the baking dish inside the preheated oven and bake everything for about 30 minutes or until done.
Remove from the oven and allow it to rest for a few minutes at room temperature.
Serve warm and enjoy!
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