Preheat the oven to 350 degrees.

Slice the challah into thick slices. Remove the ends and place the loaf in a casserole dish. In a large bowl, whisk the eggs, cream, vanilla, and sugar together until smooth. Pour mixture over the challah, and with your hands, be sure the mixture flows in between each slice. Press down the challah to ensure the challah completely absorbs the egg mixture. 

Bake in the oven for 45-50 minutes.

Remove from the oven, and let rest for 10 minutes before serving. Dust with more sugar, sprinkles and torch if you would like a crème brûlée topping.