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Cut chicken into strips sized of your choosing.
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Toss chicken in a medium bowl with half the paprika, 1.5 teaspoons salt and a pinch of pepper.
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Heat 1 tablespoon butter in a large skillet over med. high heat.
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Add chicken, cook, tossing occasionally, until opaque throughout, 4-5 minutes.
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Transfer to plate.
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Heat remaining tablespoon butter and in the same skillet.
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Add onion, cook until browned and softened.
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Add remaining tablespoon paprika and stir, cooking, about 30 seconds.
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Add tomatoes and 3/4 cup water; cook until saucy.
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Return chicken to skillet.
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Stir in sour cream and cook until just heated through, without boiling.
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Season with salt and pepper, serve.