Fry bacon in large skillet over medium heat until lightly browned, about 8 minutes. Using slotted spoon, transfer bacon to paper towels, leaving fat in pan. Refrigerate bacon.
Heat fat over high heat until smoking. Meanwhile, pat pork chops dry with paper towels and sprinkle with salt and pepper. Cook 3 chops until golden brown on both sides, about 3 minutes per side. Transfer chops to slow cooker. Repeat with remaining chops and transfer to slow cooker.
Pour off all but 1 teaspoon fat from skillet; add onions, 1 teaspoon brown sugar, 1/4 teaspoon salt, and 1/4 cup water to skillet. Scrape browned bits from pan bottom and cook over medium high heat until onions are soft, about 6 minutes. Stir in garlic and thyme and cook 30 seconds longer. Pour onion mixture over chops in slow cooker. Add broth, soy sauce and remaining 1 Tablespoon brown sugar to skillet, bring to boil and add bay leaves. Pour mixture over onions in slow cooker.
Cover slow cooker and cook on low until pork is very tender, about 8 hours.
When ready to serve, reheat bacon in large saucepan until crisp and transfer to small bowl. Remove chops to serving platter, discard bay leaves and pour liquid through mesh strainer into saucepan. Transfer solids to blender with 1 cup liquid and blend until smooth. Stir back into remaining liquid in saucepan. Mix cornstarch and remaining 2 Tablespoons water together in small bowl and stir into sauce. Cook over medium heat until thickened, about 8 minutes. Add vinegar, season with salt and pepper, pour over chops, and sprinkle with bacon and parsley. Serve.