Coat the bottom of a cast iron skillet with a little oil. Heat to medium high. Add the potatoes, onions, and peppers, a little salt and pepper and cook on medium high to high heat until starting to brown on both sides. Then reduce heat to low, cover and cook until potatoes are soft. Remove the lid, push the potatoes to one side and add the sausage and spinach or kale. Heat through, gently toss everything together, increase heat to high again and make sure potatoes have browned. Meanwhile, fry your eggs to how you like them. Place your hash in two bowls and top with your eggs. Salt and pepper to taste.