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Set your Instant Pot to saute mode (high).
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Add the oil, heat for 1 minute, and then add the chicken skin side down. Brown for about 5 minutes.
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Add the mushrooms, leeks, garlic, and chicken broth. Seal the pot, and cook on manual mode for 15 minutes at high pressure.
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Carefully use manual release to release the pressure.
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Remove the chicken to a plate, leaving the liquid and vegetables in the pot.
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In a small bowl, mix together the cornstarch with 3 tablespoons of water.
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Set the Instant Pot back to saute mode, and pour the cornstarch mixture into the remaining liquid and vegetables. Stir to incorporate it, and cook for 1-2 minutes until the sauce thickens. You can make more of the cornstarch mixture and add that in if you prefer a thicker sauce.
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Add the artichoke hearts.
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Optional: add capers into the sauce.
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Season the sauce with salt and pepper to taste.
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Serve the chicken with the veggies and sauce on its own, or over the starch of your choice. I liked this with mashed potatoes, but rice, pasta, and quinoa would all be great options.