Preheat the oven to 375° F. Grease a baking sheet with butter.
In a large shallow dish, whisk together the eggs, milk, St. Germain, 1 tablespoon vanilla, and salt.
Grab the croissants and make a 1 inch slit at the top of each.
In a bowl, gently stir together the cream cheese and strawberry jam. Spoon the mixture into a ziplock bag and snip the corner. Fill each croissant.
Dip each filled croissant into the egg mixture, allowing it to soak for 1 minute per side.
Brush each croissant with the leftover egg batter. Bake for 20-25 minutes.
Melt the butter, brown sugar, and maple syrup. Spoon evenly over each croissant.
Bake for an additional 10 minutes until caramelized.
In a bowl, toss the fresh strawberries with vanilla and maple syrup.
Serve warm, topped with whipped cream and maple syrup.