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Heat oil in a medium saucepan over medium-high heat. Season chicken with salt and pepper, and add to the pan. Cook each side for about 3 minutes each, or until light golden-brown. Remove the chicken from the pan.
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Add the belle pepper and onion to the pan, stirring occasionally until the onions begin to soften., about five minutes. Add the garlic, and cook for one minute.
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Deglaze the pan by pouring in the wine. Reduce the wine by about half, then pour in the canned tomato, chicken broth, oregano, and red pepper flakes. Bring to a boil, and reduce the heat to medium-low. Simmer for about 20 minutes.