Cut chicken breast into strips.
Finely dice onion and slowly fry in a pot until golden brown. Add the meat. Briefly fry thyme, oregano, cumin and paprika powder. Add rice and pour in chicken stock.
Blend tomatoes with a blender and add as well. Season with salt and pepper, simmer slowly until rice is cooked.
Serve rice meat in a deep plate and garnish with some sour cream and fresh marjoram.