Hearty Vegetarian Bean Stew

cooking spray

1 spray(s)

shallot

1 medium, minced

garlic

1 small clove(s), minced (optional)

carrots

1 small, sliced 1/2-inch thick

celery

1 rib(s), chopped

bell pepper

1 item(s), small, chopped

canned pinto beans

1 cup(s), or garbanzo beans, drained and rinsed

spinach

1 cup(s), coarsely chopped

dried thyme

¼ tsp, crushed

table salt

¼ tsp

black pepper

¼ tsp

red pepper flakes

⅛ tsp, crushed

vegetable broth

1 cup(s), or more if necessary