Ingredients

2  (15 oz) cans sweet potatoes in light syrup, drained
1/2 cup salted butter, melted
1 (14-oz) can sweetened condensed milk
1 Tbs vanilla extract
1 Tbs pumpkin pie spice
1 pkg (2 layer) spice cake mix or yellow cake mix
1/2 cup salted butter, cold, cut into small pieces
1/2 cup chopped pecans (optional)
whipped cream or vanilla ice cream, to serve, if desired

Directions

1. Preheat the oven to 350 degrees. Grease a 9×13-inch baking pan; set aside.
2. Combine drained sweet potatoes, 1/2 cup melted butter, sweetened condensed milk, vanilla, and pumpkin pie spice in a large bowl. Beat until almost smooth with an electric mixer. There may still be some small chunks of sweet potato.
3. Spread sweet potato mixture evenly into the prepared pan. Sprinkle cake mix over the sweet potato mixture. Place cold butter pieces evenly over cake mix. Sprinkle with pecans, if using.
4. Bake until golden brown and set, about 45 minutes. Cool at least 20 minutes in pan before serving. Serve with whipped cream or ice cream, if desired.