Vegan Au Gratin Potatoes (Creamy Potato Casserole)

Ingredients

• 4 yukon gold potatoes, thinly sliced (about 5 cups)
• 2 tbsp olive oil
• 3 shallots, sliced (about 3/4 cup)
• 6 cloves garlic, minced
• 2 tbsp all purpose flour
• 3/4 cup unsweetened almond milk (or any type of plant-based milk)
• 1 can (14oz) full fat coconut milk
• 1/2 tsp dried thyme
• 1/2 tsp dried rosemary
• 1 tbsp dijon mustard
• 2 tbsp nutritional yeast
• 1 tsp kosher salt
• black pepper
• fresh parsley or thyme, for topping