Heat oil in a Dutch oven over medium-high heat. Add onion to pan; sauté 6 minutes or until onion is tender and begins to brown. Add 5 cups kale, 1/4 cup broth, salt, and peppers to pan. Cover, reduce heat, and cook 4 minutes. Add remaining 5 cups kale and remaining 1/4 cup broth to pan. Cover and cook 16 minutes or until tender, stirring occasionally. Sprinkle with bacon. Serve with lemon wedges.