In a medium bowl, mix ricotta cheese, cream cheese, vanilla extract, and powdered sugar until smooth and creamy. Add a splash of milk if needed.
Using a paring knife, carefully cut a pocket into each bread slice without cutting all the way through.
Fill each bread pocket with about 2 tablespoons of the creamy filling and several slices of fresh strawberries.
In a large bowl, whisk together eggs, milk, granulated sugar, cinnamon, vanilla extract, and salt until fully combined.
Heat a non-stick skillet over medium heat and melt butter evenly across the surface.
Dip each stuffed bread slice into the custard mixture for about 15 to 20 seconds per side. Avoid over-soaking.
Place the soaked bread slices onto the hot skillet and cook for 3 to 4 minutes per side until golden brown and slightly crisp.
Continue cooking remaining slices, adding more butter as needed.
Serve Fluffy Stuffed Strawberry French Toast warm with powdered sugar, maple syrup, whipped cream, and extra strawberries.