Pour the drained black beans in a blender or food processor, along with the spicy onion mixture. Blend until smooth, making sure to scrape down the sides if needed.
Taste and mix-in salt, if desired. Serve immediately with your favorite chips and/or veggies.
Recipe by Slice of Jess at https://sliceofjess.com/better-than-trader-joes-black-bean-dip-recipe/