01 -  In a large mixing bowl, thoroughly whisk eggs, whole milk, heavy cream, granulated sugar, vanilla extract, ground cinnamon, and salt until the custard mixture is smooth and fully incorporated. 
 02 -  Transfer the custard into a shallow dish. Submerge each slice of brioche in the mixture for roughly 30 seconds per side, ensuring thorough absorption without oversaturating. 
 03 -  Heat 1 tablespoon of unsalted butter in a large nonstick skillet or griddle over medium heat. Arrange soaked brioche slices in the pan. Cook each slice for 2 to 3 minutes per side until golden brown and set. Add additional butter between batches as needed. 
 04 -  Transfer finished French toast to a warmed plate. Repeat the pan-frying process with remaining brioche slices. 
 05 -  Arrange French toast on serving plates. Garnish generously with maple syrup, fresh berries, and a dusting of powdered sugar as desired.