Slice the Brioche loaf into thick slices, approximately 1 inch thick.
In a deep, wide bowl, whisk together the eggs, heavy whipping cream, vanilla extract, brown sugar, cinnamon (if using), and salt until the mixture is smooth. Set aside.
Preheat a large pan over medium to medium-low heat, adding a bit of oil or cooking spray to prevent sticking.
Dip each slice of brioche into the egg mixture for about 15 seconds, ensuring it's thoroughly coated without falling apart.
Place the soaked slices into the preheated pan. Cook for 3-4 minutes on each side until they turn a delightful golden brown.
Continue with the remaining slices, following the same process for each.
Serve the French toast warm, adding maple syrup, powdered sugar, or your favorite toppings to elevate the dish.