Cut croissants into large bite size pieces and place in a greased 9x13-inch baking dish.
In a large bowl, whisk together eggs, milk, heavy whipping cream, granulated sugar,
brown sugar, vanilla, cinnamon, salt, and orange zest.
Pour the egg mixture evenly over the croissants. Gently press down to help soak the
croissants. Cover with plastic wrap and refrigerate for at least 30 minutes, or overnight for
best flavor.
Preheat oven to 350°F. Bake uncovered for 40–45 minutes, or until the top is golden and
the center is set but slightly soft. If center is still uncooked place foil over the top from
burning.