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Pre-heat pressure cooker using the BROWN setting.
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Add oil to the pressure cooker and cook onion and garlic for 2 to 3 minutes. Crush the tomatoes by hand or chop them with a knife. Add the tomatoes and all their juice, and let the mixture come to a simmer while you prepare the peppers. Season to taste with salt and freshly ground black pepper.
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Slice off the tops of the peppers and chop the pepper tops. Set aside. Hollow out the bottoms of the peppers, removing the seeds and any of the veins.
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Meanwhile, combine the chopped peppers, turkey, cooked rice, zucchini, dried oregano, lemon zest, milk, Parmesan cheese, salt and pepper in a bowl. Gently spoon this mixture into the pepper bottoms, filling all the way to the top.
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Place a steamer basket or rack in the pressure cooker. (It’s ok if the basket or rack touches the sauce.) Place the stuffed peppers on top of the rack and lock the lid in place.
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Pressure cook on HIGH for 15 minutes.
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Let the pressure drop naturally and carefully remove the lid.
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Remove the peppers to a serving platter and crumble the feta cheese on top. Add the fresh basil to the sauce and pour the sauce over the top of the peppers.