"Common beans" (black, Great Northern, navy, pink, pinto, and red kidney beans) share a bean ancestor that originated in Peru.
Cooking Tip #8
Quick, low-fat brownies: Use black bean puree in place of eggs and oil when using brownie mix. To puree beans, measure 1 1/2 cups cooked, rinsed, and drained beans. Add 1-2 tablespoons water and puree till smooth.