Gather all ingredients before starting the recipe.
Wash and quarter 3-4 small white potatoes and cover with water. Bring to a boil, turn down to a fast simmer and cook for 15 minutes or until the potatoes are firm tender.
Peel and slice 1 large Spanish onion.
Cut strips from 2 whole cubanelle peppers and slice the steak into 1/2" slices.
Heat 1 tbsp olive oil in large skillet over medium high heat and add onions, cook for 5-6 minutes or until the onions begin to soften.
Add sliced peppers, toss and cook for another 5-6 minutes, season with kosher salt and freshly ground black pepper
Drain potatoes and gently toss with peppers and onions.