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relentlesshope
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Cut each onion into quarters. Cut each quarter into ¼-inch-thick slices. Heat large skillet over medium heat. Add butter and onions; cook 45 to 50 minutes or until soft and caramel brown, stirring occasionally. Remove to Crockpot slow cooker.
Add wine to skillet; simmer 15 minutes or until liquid is reduced to about ½ cup. Remove to slow cooker.
Add broth, water, and thyme to slow cooker. Cover; cook on HIGH 2 ½ hours.
To serve, ladle soup into individual ovenproof soup bowls. Float 1 slice of toast in each bowl and sprinkle with cheese. Preheat broiler. Broil 3 to 5 minutes or until cheese is melted and golden.
Serve while hot and enjoy!