5 cups large-diced cake doughnuts (about 12 doughnuts)
3 cups large-diced French bread
Unsalted butter, for the baking dish
3 cups whole milk
1 cup heavy cream
8 large eggs
1/4 cup sugar
1 tablespoon freshly grated orange zest
2 teaspoons ground cinnamon
1 teaspoon pure vanilla extract
Maple syrup, for serving
Berries, for serving