1. Heat a Dutch oven over medium-high heat. Coat pan with cooking spray. Add corn to pan, and sauté 4 minutes or until lightly browned, stirring occasionally.
2. Combine 2 cans of beans and broth in a blender; process until smooth. Add bean mixture, remaining can of beans, tomatoes, chile paste, and salt to corn, stirring to combine; bring to a boil. Cover, reduce heat to medium, and simmer 15 minutes, stirring occasionally. Serve with yogurt.