Place peas in a lightly greased 6-qt. slow cooker.
Combine mustard and next 2 ingredients; sprinkle over pork chops. Dredge pork in flour.
Cook pork, in batches, in hot oil in a large nonstick skillet over medium-high heat 3 to 4 minutes on each side or just until browned. Transfer pork to slow cooker. Reserve drippings in skillet.
Sauté onion in hot drippings over medium-high heat 6 to 7 minutes or until tender. Add chicken broth, and cook 2 minutes, stirring to loosen particles from bottom of skillet. Spoon onion mixture over pork in slow cooker. Cover and cook on LOW 6 hours.