Photo of Easiest Ever Sweet Potato Casserole by WW

Easiest Ever Sweet Potato Casserole

Total Time
45 min
10 min
35 min
Since sweet potatoes already have inherent sweetness (hence their name), we don’t add any sugar to the filling of this casserole. And the topping—a buttery oat-based streusel with pecans—only contains a hint of brown sugar. The trick to making this the easiest-ever version of the beloved holiday side is to use canned sweet potato puree. Seek out unsweetened puree, as many canned sweet potato products are loaded with sugar. You might have to visit a grocery store specializing in healthier options.


Cooking spray

5 spray(s)

Canned mashed sweet potatoes

6 cup(s), unsweetened

Vanilla extract

1½ tsp

Ground cinnamon

1 tsp

Kosher salt

¾ tsp, divided


3 large egg(s), lightly beaten

Uncooked old fashioned rolled oats


Chopped pecans

2 Tbsp

All-purpose flour

1 Tbsp

Unpacked brown sugar

1 Tbsp

Unsalted butter

1 Tbsp, melted


  1. Preheat oven to 375°F. Coat a 2-quart casserole dish with cooking spray.
  2. Combine sweet potato puree, vanilla, cinnamon, ½ teaspoon salt, and eggs in a large bowl, stirring until well blended. Pour mixture into prepared casserole dish.
  3. Combine oats, pecans, flour, brown sugar, butter, and remaining ¼ teaspoon salt, tossing well. Sprinkle mixture evenly over sweet potato mixture. Bake at 375°F until filling is bubbly and topping is lightly browned, about 35 minutes.
  4. Serving size: ½ cup