01 - Preheat oven to 375°F. Lightly grease a 6-cup muffin tin.
02 - In a small bowl, blend softened butter with minced garlic and chopped parsley until well combined.
03 - Flatten each bread slice with a rolling pin; trim crusts if necessary to fit into the muffin tins.
04 - Spread a thin layer of garlic butter on one side of each bread slice, then press buttered side up into each muffin cup, creating a nest.
05 - Sprinkle Parmesan cheese into the base of each prepared bread cup.
06 - Crack one egg into each bread cup. Season eggs with salt and black pepper; sprinkle with shredded cheese if desired.
07 - Bake for 16 to 18 minutes, or until egg whites have set and yolks reach preferred doneness.
08 - Allow the cups to cool for two minutes, then gently lift each from the tin using a small spatula.
09 - Serve warm, garnished with extra fresh parsley if desired.