Preheat oven to 375 F. Place small ramekin (see below for muffin tin or 8x8 casserole dish instructions) on a rimmed baking sheet for easy oven transfer. Use a pastry brush to coat the bottom and edges of the ramekin in melted butter. Psst--You can bake multiple ramekins at once. My ramekins are 4" in diameter.
Crack eggs into ramekin and bake for 12-14 minutes, checking often so they don't overcook. The goal is runny yolks with the white portion set.
Add toppings to your baked eggs, and serve with bread or a spoon. Enjoy!
Notes
Muffin tin pan eggs: Grease and add 1 egg per. Bake for 10-12 minutes.
8x8 casserole dish: Grease and add eggs to casserole dish. Bake and start checking at 15 minutes, bake times will vary with the number of eggs added.