01 - Preheat oven to 375°F (190°C). Lightly grease a 6-cup muffin tin.
02 - In a small bowl, mix together softened butter, minced garlic, and chopped parsley until evenly combined.
03 - Flatten each bread slice with a rolling pin. Trim crusts if necessary to fit each muffin cup.
04 - Spread a thin layer of garlic butter on one side of every bread slice. Press each bread slice butter-side-up into a muffin cup, forming a nest shape.
05 - Sprinkle a bit of grated Parmesan cheese into the bottom of each bread cup.
06 - Crack one egg into each bread cup. Season eggs with salt and black pepper. Add shredded cheese on top if desired.
07 - Bake for 16 to 18 minutes until egg whites are set and yolks reach preferred doneness.
08 - Remove from oven and cool for 2 minutes. Run a small spatula around each cup to release. Carefully lift out each egg cup.
09 - Serve warm. Garnish with extra parsley as desired.