Thinly slice the cremini mushrooms and toss them in a bowl with the creamy garlic sauce — heavy cream, melted butter, garlic, Parmesan, salt, and pepper.
Transfer the mixture to an oven-safe dish, make a well in the center, and crack an egg into it.
Season lightly with salt and pepper, then bake at 400°F for about 15 minutes until the egg white is set and the yolk is still runny.
Finish with a sprinkle of chopped parsley and serve immediately with toasted ciabatta or baguette.
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Notes
Baking time can vary depending on your oven and dish size — check around the 12-minute mark if you like a very runny yolk. The Parmesan helps thicken the sauce as it bakes, so don't skip it.