Warm the olive oil in a nonstick frying pan and cook the diced onion for about 5 minutes.
Stir in the vegetables ( peas, corn and carrot ) and ground chicken.
Season with salt and pepper to taste and dried oregano.
Cook for about 10 minutes
Stir in the cooked rice and pour the water and tomato paste mixed together.
Cook for about 5 minutes or until everything is combined and creamy.
Remove the stems from the bell peppers and stuff each one of them with the cooked ground chicken filling.
Top with grated mozzarella cheese and bake in an already preheated oven at 350 F or 180 C degrees for about 15 minutes or until the cheese is all melted and golden brown in color.
Serve and enjoy.