Rinse the black beans in a fine-mesh sieve. Sort the beans on a sheet pan or another flat surface, removing any stones or broken black beans.
In a 6-quart or larger slow cooker, stir together the dry black beans, diced onion, grated garlic, tomato paste, chili powder, cumin, smoked paprika, salt, and vegetable broth.
Cover with the slow cooker lid. Cook on high heat for 4 ½ to 5 ½ hours. Check 2 to 3 beans at the 4 ½ hour mark, adding more time as needed. I find that they are usually perfectly tender at around 5 hours.
The black beans can be served with or without the seasoned cooking broth. Use a slotted spoon if serving without the broth. Enjoy!
Notes
1 cup (roughly 7 ounces) of dry black beans yields about 3 cups of cooked beans.
The recipe can be doubled. Simply double all ingredients, including seasonings.
Freezing: Black beans freeze well. Let cool to room temperature before transferring to a freezer-safe container. For best quality, freeze for up to 3 months. Let thaw overnight in the fridge before reheating.
Reheating: Reheat large portions in a pot on the stovetop over medium heat, stirring occasionally until heated through. Individual portions reheat quickly in the microwave.