• Slice the brioche bread into chunks. I sliced each slice of brioche into 9 pieces.
  
• Place the brioche chunks into a large buttered baking dish.
  
• Empty the apple pie filing onto a cutting board and cut the apple chunks into bite-sized pieces.
  
• Sprinkle the apple chunks over the top of the brioche pieces.
• In a bowl, whisk together the eggs, milk, heavy cream, sugar, vanilla, and cinnnamon.
  
• Pour the egg mixture over the top of the brioche chunks.
  

Baking Now or Later

• If you want to bake the french toast casserole now proceed to the topping section and preheat your oven to 350°.
• If you want to wait to the next morning to bake, cover with plastic wrap and place in your refrigerator until the next day.

Topping

• If your casserole has been in the refrigerator overnight, remove the place on your counter.
• Preheat your oven to 350°. In a small saucepan, melt your butter.
• Once the butter is melted, add the brown sugar, cinnamon, and salt.
• Stir until it's all combined, then drizzle on top of the breakfast casserole.
  

Baking

• Bake the casserole for 45-60 minutes until the top of the casserole is browning.
• Let it cool 15-20 minutes before serving.