Mushroom Kidney Bean Burgers - Half Cup Habit

Ingredients

• 2 tbsps olive oil (extra virgin)
• 1/2 yellow onion (large, chopped)
• 3 cloves garlic (chopped)
• 1 tsp chili powder (chipotle)
• 2 tsps cumin (ground)
• 1 tsp salt (kosher; plus more to taste)
• 12 ounces mushrooms (cremini; cut into 1/2-inch dice)
• 4 ounces mushrooms (shiitake; stems discarded and caps cut into 1/2-inch dice)
• 1½ cups kidney beans, red (cooked or canned, no-salt-added. Drained, rinsed, and lightly mashed with a fork. (From 1 15 oz can))
• ½ cup walnuts (toasted and chopped)
• 1 tbsp liquid aminos (or coconut aminos or tamari)
• ¾ cup chickpea flour
• ¼ cup nutritional yeast
• 1 tbsp lime juice (fresh)
• ¼ cup vegetable oil (plus more for oiling the measuring cup)
• 6 buns (hamburger; lightly toasted)
• Condiments (and accompaniments of your choice)