Heat olive oil in a large sauté pan over medium heat. Add onions, stir and cook until completely softened and browned. While the onions brown, place chopped veggies and garlic into slow cooker. Add tomato paste to the onion pan and stir. Transfer the onions and tomato paste to the slow cooker and stir until all vegetables are coated. Cover and cook for 4 hours on high. When you’re almost ready to serve, add beans and stir. Cook for 15-30 minutes, uncovered. Add basil and serve.
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