In a large saucepan, heat oil over medium heat. Add garlic; cook and stir until tender, 30-45 seconds. Stir in 2 cans of beans, pepper and broth., Puree mixture using an immersion blender. Or puree in a blender and return to pan. Stir in remaining can of beans; bring to a boil. Reduce heat; simmer, covered, 15 minutes, stirring occasionally., Stir in spinach and basil; cook, uncovered, until spinach is wilted, 2-4 minutes. If desired, serve with cheese.