Chef John's Sweet Potato Casserole

Ingredients

• 2.5 pounds sweet potatoes , peeled and cubed
• salt
• 2 tablespoons butter
• 2 large eggs
• 0.25 cups maple syrup
• 0.25 cups buttermilk
• 0.33 cups milk
• 0.5 teaspoons vanilla extract
• 0.5 teaspoons salt
• 1 pinch ground allspice
• 1 pinch cayenne pepper

Instructions

1. 1

   Preheat oven to 350 degrees F (175 degrees C). Grease a 2 1/2-quart baking dish with butter.

2. 2

   Place sweet potato cubes into a large pot, cover with water, and add a large pinch of salt. Bring to a boil and cook until a knife is easily inserted into a sweet potato cube, about 10 minutes. Drain well. Return to the pot and mash 2 tablespoons butter into sweet potatoes.

3. 3

   Whisk eggs, maple syrup, buttermilk, milk, vanilla extract, cayenne pepper, allspice, and 1/2 teaspoon salt together in a large bowl until smooth. Gradually mash sweet potatoes into egg mixture, starting with 2 tablespoons of sweet potato mixture, until all sweet potatoes are incorporated. Transfer sweet potatoes into prepared baking dish.

4. 4

   Mix pistachios, brown sugar, flour, and 1/4 cup melted butter together until completely mixed. Crumble topping evenly over top of sweet potatoes. Use the back of a fork to gently press pistachio mixture down onto sweet potatoes.

5. 5

   Bake in the preheated oven until topping is browned and casserole is set, 25 to 30 minutes. If desired, place under oven's broiler for 5 minutes to give topping a little more brown color. Let rest to cool slightly before serving, about 10 minutes.