No one knows the exact origin of stuffed peppers because many different cultures share the affinity for peppers stuffed with a cheesy, meaty, rice filling dating back thousands of years.  In Spain, pimientos rellenos are the peppers of choice, stuffed with Manchego cheese, chicken, or cod in a red sauce.  In India, bharvan mirch are made by stuffing bell peppers with meat, potatoes and onions heavily seasoned with ethnic seasonings.  In the Eastern Mediterranean, some types of dolma are enjoyed stuffed with vegetables, fruit, offal or seafood.  In Mexico, chile relleno, literally "stuffed pepper," is made of a roasted and skinned green pasilla or poblano peppers stuffed with queso fresco, meat, and deep fried. In Guatemala, the pimiento pepper is stuffed with shredded pork and vegetables. In Baltic countries, peppers are stuffed with ground beef (or pork), rice, various vegetables and spices.  So, it seems practically every country has their own version of stuffed peppers because the combination is just too good!