In a large skillet, heat the vegetable oil over medium heat. Add the chicken and sauté about 5 to 7 minutes until chicken is cooked through. Chicken is done when a meat thermometer inserted in the center reaches 165 degrees F
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Add the diced tomatoes and simmer until heated through. Add the butter and stir until melted.
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To serve, divide rice among 4 bowls. Spoon Cajun Butter Chicken over rice. Garnish with sliced spring onions