Add the beans, aromatics, broth and seasonings to the slow cooker. Cover and cook on low for 5-8 hours. If you're cooking kidney beans, boil them for 10 minutes first, to get rid of a naturally occurring toxin that they're high in.
2 cups beans, 8 cups vegetable broth, 1 onion, 2 cloves garlic, seasonings of choice, 1 teaspoon salt