1. Heat oven to 375°F
2. Cook rice in water as directed on package.
3. Meanwhile, in 12-inch nonstick skillet, brown ground beef over medium-high heat until thoroughly cooked, stirring frequently.
4. Drain and add corn, chiles and egg; mix well.
5. Stir in cooked rice and 1 cup of the cheese.
6. Cut bell peppers in half lengthwise; remove seeds and membrane.
7. Place cut side up in ungreased 13x9-inch (3-quart) glass baking dish.
8. Spoon about 3/4 cup beef mixture into each pepper half, mounding as necessary.
9. Top each with 2 tablespoons salsa.
10. Cover tightly with foil.
11. Bake at 375F for 35 to 40 minutes or until peppers are crisp-tender.
12. Uncover; sprinkle with remaining 1/2 cup cheese and the onions.
13. Bake uncovered an additional 5 to 10 minutes or until cheese is melted.