Melt the butter in a non-stick pan over low-medium heat. Add the corned beef, onion, and pepper. Cook until the onion and pepper are tender, about 8-10 minutes. Season with salt and pepper to taste.
Heat oil in a non-stick pan over medium heat. Once the pan is hot, crack the eggs on a flat surface and into the pan (being careful not to break the yolks).
Cook the eggs until the whites are mostly firm for about 2-3 minutes, then gently flip the eggs with a spatula and cook for 30 seconds more. While the eggs are cooking, toast the bread.
Season with a pinch of salt and pepper and serve with corned beef hash, toast and pears.