In a large skillet melt one tablespoon of butter over medium heat. Add the onions and sauté until slightly soft.
Add the additional tablespoon of butter and diced potatoes, stir until coated with the butter. Sprinkle with season salt, parsley, and red pepper flakes, mix well.
Cook potatoes and onions over low to medium heat, adjust heat as necessary until the potatoes have softened and develop a nice golden color.