Prepare the bread by laying it down on a hard surface using the cookie cutter to punch a heart-shaped hole in the center of the bread. Be sure that the surrounding bread stays intact. If you allow it to open, the egg will not stay inside the bread.
Spread 2 tbsp. of butter on both sides of the bread and the heart cutout. Then, melt the other 2 tbsp. in a pan over medium-low heat.
Crack the eggs into 4 separate cups.
Lay the bread into the pan carefully and allow it to toast on one side. Then, flip the bread over and carefully pour the egg into the heart-shaped hole in the bread.
Cook for 5-6 minutes over low heat or until the white part of the egg is set.
Then, remove from the pan and season with salt and pepper.
Toast the remaining heart cutouts in the pan and serve alongside the egg-in-toast.