Combine 1/4 cup broth, milk, flour, mustard, salt, and pepper in a small bowl; stir with a whisk. Set aside.
Sprinkle one side of each pork chop with paprika and thyme. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add half of the pork to pan; sauté 1 1/2 minutes on each side or until pork is done and lightly browned. Remove pork from pan. Repeat procedure with remaining pork. Reduce heat to medium. Add chopped onion; sauté 4 minutes or until lightly golden. Add remaining 3/4 cup broth; bring to a boil. Cook 2 minutes. Add milk mixture, stirring with a whisk. Add pork, turning to coat; cook 1 minute. Sprinkle with minced parsley.