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Pre heat oven to 350.
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Cut chicken breasts in half if using.
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Roughly crush peppercorns with pedestal or in a Ziplock bag with a rolling pin.
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Sprinkle both sides of the chicken with salt and peppercorns.
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Heat oil in an oven safe frying pan.
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Sear chicken until golden brown on one side, about 4 minutes. Flip and add onion and garlic. Sear second side about 4 minutes.
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Remove chicken to plate while leaving the onions in the pan. Cover chicken. Add white wine to pan and de glaze, scrapping up all the brown bits.
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Add cream and parmesan cheese, stir to mix and gently heat until simmering. Simmer 5 minutes, reducing cream by about 1/3.
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Add chicken to pan and place uncovered in oven for about 20 minutes. Sauce will thicken and chicken will cook through.
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Remove from oven and let rest 5 minutes.
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Garnish with basil leaves just before serving with rice.