Preheat oven to 350. Then spray a 9x13" baking dish using nonstick cooking-spray.
Cut bread into 1-2" squares & add to bowl. In a separate bowl whisk together your cream, milk, eggs, vanilla, sugar, cinnamon & nutmeg until combined.
Pour over bread and stir lightly to coat, let boil for approximately 20minutes.
Spread into baking dish & bake in oven for approximately 50-60minutes until center is set. In saucepan whisk together sugar, flour & thick cream until blended.
Add on your own butter and heat on medium until butter melts and liquid begins to boil.
Whisk until thickened slightly then remove from heat & stir in vanilla.