Mushroom Artichoke Soup

5 14 oz. cans of quartered Artichoke Hearts

3 Lbs. Fresh Button Mushrooms sliced

1 Lbs. chopped onion

1 Lbs. frozen spinach

12 cups beef broth

1/2 cup Olive Oil

Tbs. Salt

Tbs. Pepper

tsp. red pepper flakes

tsp. thyme

tsp. garlic powder