Preheat oven to 350 degrees.
Heat olive oil in a large skillet over medium heat. Add onion. Cook 3-5 minutes or until softened.
Lower heat, and add garlic. Cook 30 seconds, stirring often so garlic doesn’t burn. Add rice, black beans, tomatoes and chiles, lime juice, Taco Seasoning, and salt. Cook 10 minutes, stirring occasionally.
While sauce is cooking, prepare peppers. Cut in half lengthwise, and remove stems and seeds. Place peppers in boiling water for 5 minutes. Drain in colander, and place in a large baking dish, cut side up.
When sauce is finished, spoon mixture into pepper halves (about ¼ to 1/3 cup, depending upon pepper size). Add hot water to baking dish to a depth of ½ inch. Bake uncovered for 20 minutes.