Preheat oven to 375°F (190°C).

In a food processor, combine carrots, red bell pepper, jalapeno pepper, cumin, coriander, paprika, salt, pepper, garlic, and olive oil.

Pulse until finely chopped.

Add 3/4 of the black beans to the food processor.

Pulse for 30-60 seconds, until the mixture starts to hold together.

Transfer the mixture to a mixing bowl.

Stir in the remaining black beans by hand.

Form the mixture into six patties.

Place the patties on a baking sheet.

Bake for 40-45 minutes, until the edges are crisp and the patties start to hold together.

Let the patties cool on the baking sheet for 10 minutes before placing on buns.

Serve on thin hamburger buns with sliced avocado and lettuce.

Add ketchup, if desired.