Preheat oven and butter pan:
Heat oven to 350°F (175°C) and butter a 12-cup muffin pan.Nestle bread into cups:
Slice bread into quarters and softly nestle each piece into a muffin cup.Whisk custard ingredients:
In a bowl, combine eggs, milk, sugar, vanilla, cinnamon, nutmeg, and salt with a whisk.Ladle custard over bread:
Ladle the custard over the bread pieces and gently push down.Bake and rotate pan:
Bake for 22-25 minutes, turning the pan halfway to ensure uniform browning.Cool and serve warm:
Let cool briefly, then lift from the pan and serve warm.