Heat the oil on medium-high in an extra-deep, 12-inch skillet. Peel and coarsely chop the onion, adding it to the skillet as you chop. Add the beef (fresh or partially defrosted) to the skillet, turning and breaking up the meat from time to time.
Add the garlic and continue to cook, stirring frequently, until all of the meat is crumbled and browned, 5 to 6 minutes.
Reduce the heat to medium. Add the tomatoes with their juice, corn and the cooked rice to the skillet. Stir to mix well. Reduce the heat to low, and stir in the salsa-cheese sauce. Continue to cook until the sauce is heated through completely, about 2 more minutes. Spoon the beef mixture into the pepper halves and serve at once.
Nutrition information per serving:
Calories533Fat23 gSodium1,556 mg
Carbohydrates40 gSaturated fat13 gProtein36 gCholesterol117 mgDietary fiber4 g