Boulangere Potatoes

Ingredients

• 1 leek, thinly sliced
• 1 yellow onion, thinly sliced
• 1 stalk celery, thinly sliced
• 2 shallots, thinly sliced
• 2 tablespoons chopped garlic
• 1 tablespoon granulated garlic
• 1 tablespoon granulated onion
• 6 cups low-sodium vegetable broth
• 9 medium Yukon gold potatoes, peeled and very thinly sliced
• 1 tablespoon chopped, fresh flat-leaf parsley, or 1 teaspoon dried
• 1 tablespoon chopped fresh thyme, or 1 teaspoon dried