Bring the bread slices and use butter to coat them well. Bring the baking pan out of your preheated oven and spray using the cooking spray.

Put together the bread pieces in your prepared baking pan.

Then take a saucepan and pour the milk into this pan. Boil up the milk and when it gets a good boil, lower the heat.

In a separate mixing bowl, add the eggs and beat them until the eggs are turned fluffy. Add some sugar to the blended eggs and stir to dissolve the sugar.

Pour some vanilla into the mixture and get it merged into it. Now that your mixture is prepared, pour it into the boiled milk.

Continue whisking the mixture while pouring this mixture into it.

Bring your freshly grounded cinnamon and nutmeg. After transferring the milk and egg mixture into the prepared baking pan, over the buttered bread slices.

Sprinkle the cinnamon and nutmeg over it.

Now that you know your oven is already preheated, start baking your casserole in this oven. Continue baking for more than half an hour.

Once baked, serve your bakes custard while refrigerated.