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preheat oven to 450 degrees
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mix the chopped frozen spinach, feta, cream cheese, garlic and half of the salt in a medium sized bowl.
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cut a pocket into each chicken breast.
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separate the spinach and cheese mixture into four parts, and roll into thick logs.
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stuff each log into the pocket you made in the chicken breasts.
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season with salt and pepper.
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heat the olive oil in an ovenproof pan set over medium high heat, then add the stuffed chicken, "top" side down.
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cook for 5 minutes, then flip the chicken over.
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place the pan into the oven, and bake for 10 minutes.
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if your chicken breasts are extraordinarily thick, cook for 2 to 5 minutes longer, or until juices run clear when you poke the chicken with a fork.