Preheat a large non-stick skillet to medium heat.
Season the liver with salt, and garlic powder.
Add the butter to the skillet, once melted add the liver.
Let it cook for about 3 minutes and flip.
Add onions, lower the heat and cover with a lid.
Let it cook for another 5 minutes or until the onions are soft and the liver is fully cooked and serve.
Serving Size 1 piece
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.