01 - In a medium bowl, combine ricotta cheese, powdered sugar, vanilla extract, and lemon zest (if using). Stir until the mixture is smooth and homogenous. Set aside.
02 - Arrange the bread slices on a clean surface. Generously spread approximately 2 tablespoons of the prepared ricotta filling onto half of the bread slices. Cap each filled slice with a second bread slice, creating sandwiches.
03 - In a shallow bowl, thoroughly whisk together the eggs, whole milk, vanilla extract, granulated sugar, ground cinnamon, and a pinch of salt until well combined.
04 - Place a large nonstick skillet or griddle over medium heat. Add 1 tablespoon of unsalted butter and allow it to melt and coat the cooking surface.
05 - Carefully dip each assembled French toast sandwich into the egg batter, ensuring both sides are evenly coated. Avoid over-soaking to maintain the integrity of the bread and filling.
06 - Place the battered sandwiches onto the preheated skillet. Cook for 3 to 4 minutes per side, until a beautiful golden-brown crust forms and the interior is thoroughly heated. Add additional butter as needed between batches.
07 - Present the French toast warm. Dust generously with powdered sugar, drizzle with maple syrup, and garnish with fresh berries.