1. Heat a grill pan over medium-high heat.
2. Combine first 6 ingredients; spread evenly over 4 bread slices. Top evenly with turkey, watercress, cheese, and remaining 4 bread slices.
3. Coat grill pan with cooking spray. Arrange 2 sandwiches in pan. Place a cast-iron or heavy skillet on top of sandwiches; press gently to flatten. Cook 2 minutes on each side (leave cast-iron skillet on sandwiches while they cook). Repeat procedure with remaining 2 sandwiches.
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