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Turn off heat and let cool slightly.
Season chicken breasts with oregano, red pepper flakes, salt, pepper and garlic powder.
Go easy on the salt as the onion and cheese are already salty. Arrange the chicken breasts in the baking dish.
Spread caramelized onions over each chicken breast. Sprinkle grated cheese on top and bake for 20-25 minutes (or longer, depending on the thickness of your chicken breasts), until the cheese is cooked through and bubbly.
Then grill for 2 minutes until the cheese is golden.
Garnish with chopped fresh parsley and serve immediately with steamed vegetables and rice.