Slice croissants in half lengthwise.
Whisk together milk, eggs, and vanilla. Pour into a shallow dish. Dip croissant halves into egg mixture, coating well.
Melt 1 tablespoon butter in a large nonstick skillet over medium heat. Add four croissant halves, and cook about 2 minutes on each side or until golden brown. Repeat procedure with remaining butter and croissant halves. Sprinkle with powdered sugar; top with Sweetened Whipped Cream, if desired, and Fresh Strawberry Syrup.