01 - Preheat oven to 375°F. 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 and trim crusts as needed for a snug muffin cup fit.
04 - Spread a thin layer of garlic butter on one side of each bread slice. Place bread butter-side-up into each muffin cup to form a nest shape.
05 - Sprinkle grated Parmesan cheese into the bottom of each bread-lined cup.
06 - Crack one egg into each prepared cup. Season with salt and black pepper. Top with shredded cheese if desired.
07 - Bake for 16 to 18 minutes, or until the egg whites are set and yolks reach desired doneness.
08 - Let the bread cups cool in the tin for 2 minutes. Gently lift out using a small spatula and serve warm, garnished with additional parsley if preferred.