Preheat the oven to 200°C. Mix the chicken, peppers, onion, paprika, oregano, salt, pepper, olive oil and balsamic in a large bowl and make sure everything is coated in the spices and oil. Place in the oven for 20-30 minutes until chicken is cooked through.
To make the tomatoes, mix together all the ingredients, seasoning to taste, and set aside until ready to serve.
For the sour cream sauce mix everything together and set aside until ready to serve.
When you're ready to eat serve the chicken in flatbreads with the tomatoes and sour cream.