Rub chops with Kosher salt and pepper. Brown chops in skillit with 1 tbs. Olive oil until golden brown. Layer chops in sprayed crock with onions. Add butter to skillit on med. High heat stir until deglazed. Add flour and stir with slotted spoon for about 30 seconds until it gets bubbly. Add broth and keep stiring until it thickens and bubbles. Add garlic and red wine vinegar. Pour over chops and onion. Cover and cook on low for 4 to 5 hours.