1. Fill bread slices with Kraft Singles to make 2 sandwiches; lightly press edges of sandwiches together to seal.
2. Whisk egg, milk and vanilla in pie plate until blended.
3. Dip sandwiches, 1 at a time, in egg mixture, turning to evenly moisten both sides of each sandwich.
4. Melt margarine in large skillet on medium heat. Add sandwiches; cook 2-1/2 to 3 min. on each side or until Singles are melted and sandwiches are golden brown on both sides. Serve topped with syrup.