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Cut each chicken breast in half horizontally to make 4 even-sized pieces. In a large shallow dish, mix flour, garlic powder, onion powder, salt and black pepper. Dredge each chicken piece in the flour mixture, shake off excess, and set aside.
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In a large pan, heat 2 tablespoons of oil over medium-high heat. Cook the chicken for a few minutes on each side until they develop a golden crust and are nearly cooked through. Transfer them to a plate, lower the heat to medium.
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In the same pan, toss in the spinach and cook for about 30 seconds until it starts to wilt, then take it out and set it aside.
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Cook the onion for a couple of minutes until it's soft. If needed, add 1 tablespoon of oil to the pan.
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Pour in the chicken stock and mix in the Boursin until it's well combined with the stock. Let it simmer for a few minutes until the sauce starts to thicken. Return the spinach and the chicken, simmer for about 30 seconds to thicken. If the sauce is too thick, add a bit of stock; if too thin, simmer more.
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Serve and enjoy!