01 - Preheat the oven to 375°F (190°C) and lightly grease a 6-cup muffin tin.
02 - In a small bowl, blend the softened butter with minced garlic and chopped parsley until evenly combined.
03 - Flatten each bread slice using a rolling pin. Trim crusts as needed to fit snugly in the muffin cups.
04 - Spread a thin layer of garlic butter mixture on one side of each flattened bread slice. Gently press each bread slice, buttered side up, into the muffin cups to form nests.
05 - Sprinkle a small amount of grated Parmesan cheese into the base of each bread nest.
06 - Carefully crack one egg into each bread cup. Season each with salt and black pepper. Distribute shredded cheese over the eggs if desired.
07 - Bake in the preheated oven for 16 to 18 minutes, or until egg whites are set and yolks reach preferred doneness.
08 - Allow the egg cups to cool for 2 minutes, then use a small spatula to gently lift them from the tin.
09 - Serve warm, garnished with extra chopped parsley if desired.