Black bean burgers

Name: Black bean burgers
Prep time: 30 min
Cook time: 35 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1 can black beans (15 oz) (drained); 1 cup old fashioned oats; 1 cup onion (finely chopped); 1 tbsp garlic (minced); 8 oz mushrooms (wiped clean and quartered); 1/2 cup walnuts; 2 tbsp nutritional yeast ((optional)); 1 tsp smoked paprika; 1/2 tsp chili powder; 1/2 tsp ground coriander; 1/2 tsp ground cumin; 2 tbsp olive oil; 1/4 tsp salt (or more to taste); 1/4 tsp fresh ground pepper (or more to taste)