Boudreaux's Cajun Potato-Leek Soup Recipe

5 pounds potatoes

peeled and cut into 1-inch cubes

3 (32 fluid ounce) containers chicken broth

divided

1 jalapeno pepper

seeded and minced

2 tablespoons dried onion flakes

2 tablespoons dehydrated minced garlic

1 pint heavy whipping cream

2 bunches leeks (white parts with a few of the green tops)

chopped

2 tablespoons ground paprika

1 (1 ounce) package dry onion soup mix (such as Lipton®)

1 teaspoon Cajun-style crab boil seasoning

or to taste