Sweet Potato Casserole with Pecan Oat Crumble

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Sweet Potato Casserole with Pecan Oat Crumble

A lightened-up version of the classic Southern side dish, this sweet potato casserole features super-smooth mashed sweet potatoes with a brown sugar pecan oat crumble on top. No marshmallows here.
Prep Time 30 mins
Cook Time 30 mins
Total Time 1 hr
Course Side Dish
Cuisine American
Servings 1 9x13 casserole (12-16 servings)
Calories 266 kcal


For the sweet potatoes:

  • 3 pounds sweet potatoes (3-4 large)
  • ¼ cup unsalted butter (4 Tbsp)
  • cup pure maple syrup
  • cup heavy cream (half & half or whole milk works too)
  • ½ teaspoon salt

For the pecan oat crumble:

  • ¼ cup unsalted butter (4 Tbsp)
  • ½ cup brown sugar (packed)
  • ½ tsp cinnamon
  • ½ tsp salt
  • pinch nutmeg
  • ½ cup all-purpose flour
  • ½ cup rolled oats (also called old-fashioned)
  • ½ cup chopped pecans


For the Casserole

  • Preheat your oven to 375 degrees F. Generously grease a 9x13 inch pan or approximately 3-quart baking
  • dish, and set aside.
  • Peel the sweet potatoes and chop into 1 1/2 inch cubes. Place cubed sweet potatoes in a large pot and
  • cover with cold water. Add a generous dash of salt and bring to a boil over medium-high heat.
  • Boil potatoes, stirring occasionally, for 10-15 minutes, until soft enough to be easily pierced by a fork.
  • Reserve about ½ cup of the potato water, then drain potatoes and return them to the pot.
  • Add butter, maple syrup, heavy cream, a small splash of the reserved potato water, and salt. Using an
  • immersion blender, blend the potatoes until completely smooth – it takes a few minutes. If you don’t have
  • an immersion blender, use a hand mixer, but the immersion blender creates a wonderfully silky texture. If
  • potatoes seem too thick, add a little more potato water and blend again.
  • Taste potatoes and add further salt or maple syrup to taste. Spread potatoes in an even layer in the
  • baking dish.

For the Crumble

  • Melt the butter in a large microwave-safe bowl.
  • Whisk in the brown sugar, cinnamon, nutmeg, and salt until combined.
  • Stir in the flour, oats, and pecans until evenly distributed. I actually use my hands at this point to ensure the mixture is thoroughly combined.
  • Sprinkle the crumble mixture evenly over the potatoes.
  • Bake for 25-30 minutes until the crumble is golden brown and smelling toasty.
  • Serve warm!


This sweet potato casserole can be prepared ahead of time (yay!). Make the potatoes through step 5 and spread in the baking dish, then cover and refrigerate overnight. You can also make the crumble ahead and keep it in the fridge overnight, separate from the potatoes. When ready to bake, proceed from step 7 and add a couple of minutes to the baking time. The casserole will keep, well-wrapped in the refrigerator, for up to 5 days.
Keyword sweet potato, thanksgiving

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