Pour vinegar in a small saucepan. Cook over medium heat 5-10 minutes until thickened and reduced by half. Tip - reduce vinegar while chicken is cooking to save time.

On half of each tortilla layer ingredients: mozzarella cheese, spinach, sun dried tomatoes, cooked chicken.

Heat a skillet over medium heat.

Fold tortilla over ingredients to form a half moon shape. Place in skillet. Cook 3-4 minutes until browned and crispy. Turn over and cook the other side the same.

Cut in half and serve.

Optional: Serve with additional drizzled balsamic reduction if desired.