The buttter and brown sugar cook with the apples to create a delicious syrup for serving over the French Toast.
Prepare Cinnamon-Apple Filling.
Cut a horizontal slit through the side of each bread slice to form a pocket. Stuff 3 tablespoons apple filling into each pocket.
Place milk, vanilla, and egg in a shallow dish; stir with a whisk until blended. Heat a large nonstick skillet over medium-high heat.
Dip each side of stufed bread in egg mixture to coat. Add stuffed bread to pan; cook 2 minutes on each side or until golden brown. Sprinkle with powdered sugar. Top evenly with remaining filling.