Heat an 8-inch skillet over medium/low heat. Add butter. When the butter is melted, but not sizzling or too hot, crack the egg into the skillet.
Let the egg cook for 3-4 minutes. If the butter starts to sizzle, turn the heat down.
The egg is done when the white is cooked. The white is undercooked if the membrane is still runny & overcooked if it's bubbly or brown.
Remove the egg from the skillet and season with salt and pepper. Serve with your favorite breakfast items!