Melt butter in a medium nonstick skillet over medium heat. Add onion; sauté 5 minutes or until lightly browned. Combine onion, sweet potato, next 4 ingredients (through pepper), and 1/4 cup cheese in a large bowl, tossing to coat with flour. Coat a 4-quart electric slow cooker with cooking spray. Transfer vegetable mixture to slow cooker.
Pour broth over potato mixture. Sprinkle with remaining 1/4 cup cheese. Cover and cook on LOW for 4 hours or until potato is tender.
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Really easy and delicious. I have made this at least six times now. One of our favorite sweet potato recipes. Works especially well at Thanksgiving both to avoid having another dish in the oven and to replace the traditional sweet potatoes with marshmallows kind of dish (which we don't care for).