1. Heat a large Dutch oven over medium-high heat. Add oil to pan; swirl to coat. Add red pepper and garlic; sauté 30 seconds.
2. Add kale, turning with tongs to coat. Add broth; cover and cook 3 minutes. Add salt and beans; cook, uncovered, 5 minutes, stirring occasionally. Remove from heat, and stir in vinegar. Sprinkle with cheese, if desired.
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