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Preheat the oven to its highest temperature and arrange a shelf in the top third of the oven.
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Cut 3 diagonal slits across the top of each chicken breast and prick the chicken pieces with the sharp point of a small knife.
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Place them in a single layer in a large baking dish and rub both sides with the salt and lemon juice. Leave for 5 minutes.
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Meanwhile, combine the cream with the garam masala, cayenne, cumin, paprika, garlic and ginger in a bowl.
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Stir this mixture well and pour over the chicken. Rub it into the meat and leave for 10 minutes (or longer - up to overnight).
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Lift the chicken pieces up - most of the marinade will cling to them - and place them in a single layer in a shallow baking pan lined with aluminum foil.
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On top of each, sprinkle a little salt, pepper, garam masala, cumin, cayenne, mint and lemon juice.
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Put into the top third of the oven and bake for 15 minutes or till the chicken is just white all the way through.
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Serve immediately, minted side up.