1Preheat your grill or a skillet over medium heat.
In a large bowl, mash the black beans with a fork or potato masher until mostly smooth.
Add the corn kernels, diced bell peppers, chopped cilantro, cumin, and chili powder to the mashed beans. Mix until well combined.
Divide the mixture into 8 equal portions and shape each portion into a small patty.
Place the patties on the preheated grill or skillet and cook for about 3-4 minutes on each side, or until they are heated through and have a nice crust.
While the patties are cooking, slice the slider buns in half and lightly toast them on the grill or in a toaster.
Spread a layer of guacamole on the bottom half of each bun.
Place a cooked veggie patty on top of the guacamole.
Add a dollop of sour cream on top of each patty.
Cover with the top half of the bun and serve immediately.