Preheat the oven to 350 degrees.
Cut away and discard the bread crusts. Brush both sides of the bread
slices with butter. Gently press each slice of bread into one cup of a
six-cup muffin pan. If the bread tears, just press it together in the
cup.
Crack one egg into the center of each bread cup. Half fill the empty cups
with water. This helps ensure even cooking. Bake for 5 minutes, or until
the eggs are set and cooked.
Gently transfer to a serving plate.