Add pre-baked diced potatoes and diced onions to a large skillet with 1 tablespoon of butter.
Cook on medium-high for about 7-10 minutes until the potatoes and onions begin to get crispy.
Add the diced corned beef and the other tablespoon of butter.
Cook until the corned beef becomes crispy, about 6-8 minutes.
Serve with a side of scrambled eggs or fried eggs on top.