01 - Preheat oven to 375°F. Lightly grease a 6-cup muffin tin.
02 - In a small bowl, blend softened butter, minced garlic, and chopped parsley until evenly combined.
03 - Flatten each bread slice with a rolling pin and trim crusts as needed to fit the muffin cups.
04 - Spread a thin layer of garlic butter on one side of each bread slice, then press buttered side up into each muffin cup to form a nest.
05 - Sprinkle grated Parmesan cheese into the bottom of each bread cup.
06 - Crack one egg into each bread cup. Season with salt and black pepper. Sprinkle shredded cheese over the top if desired.
07 - Bake for 16 to 18 minutes, or until egg whites are set and yolks reach desired doneness.
08 - Allow cups to cool for 2 minutes, gently remove using a small spatula, and serve warm. Garnish with additional parsley if desired.