Multi-Bean Soup

1 (20 ounce) package 15-bean soup mix (seasoning packet not used) OR 1 (20 ounce) package 10-bean soup mix (seasoning packet not used) 2 tablespoons olive oil, or more as needed 1 large onion, diced 12 carrots, peeled and chopped, or more to taste 15 crimini mushrooms, sliced, or more to taste 7 stalks celery, …

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