Heat oil in a large sauté pan over medium heat, then add the potatoes, onion, Serrano peppers and stir-fry for 5 minutes.
Add the cubed ham and continue to stir-fry for 10-12 minutes, or until the potatoes have mostly cooked through.
Add the bell pepper, sage, paprika, black pepper and garlic powder. Stir-fry for 3-4 minutes, or until the bell pepper is tender potatoes cooked through.
Taste and add salt if needed.