In a large ovenproof pan, heat 2 Tbsp of oil ove high heat. Add 1/2 the pork, salt, and pepper. Cook pork until it begins to brown, stirring often. Remove from heat; place in a bowl, cover to keep warm.
Repeat with remaining oil, pork, salt and pepper.
Cook onions in pan drippings until tender.
Add chiles and garlic. Cook 2 minutes.
Return pork to pan, add chicken broth, stir to combine.