Heat oven to 375°F. Lightly grease bottom of 8x8-inch baking pan.
Wash bell peppers. Slice tops off and remove seeds and inner ribs. Set aside.
Cut pouch open. Squeeze batter into large bowl.
Stir in onions, peppers, chilis and ¼ cup shredded cheese until blended.
Scoop ½ cup filling into each pepper.
Cook 40-45 minutes or until toothpick inserted into center of filling comes out clean. Carefully sprinkle remaining cheese over tops of peppers. Cook an additional 5 minutes or until cheese is melted and beginning to brown.