Generously butter a 9×13-inch baking dish and arrange the French bread slices in a single layer.

In a large bowl, whisk together the eggs, half-and-half, milk, vanilla, sugar, cinnamon, and nutmeg until smooth.

Pour this mixture evenly over the bread, ensuring each slice is well-soaked.

Cover with plastic wrap and refrigerate overnight.

The next morning, preheat the oven to 350°F (175°C). Remove plastic wrap.

Dot the bread with small pieces of butter and a sprinkle of sugar.

Bake for 35-40 minutes until the toast is golden and puffed.

Let it cool for a few minutes, sprinkle extra sugar on top, and broil briefly to caramelize