Sweet Potato Dessert Squares

Ingredients for crust:
· 1 package yellow cake mix, divided
· ½ cup butter, melted
· 1 egg, slightly beaten

Ingredients for filling:
· 3 cups mashed sweet potatoes, cold
· 2/3 cup milk
· ½ cup brown sugar
· 2 eggs, slightly beaten
· 1 tablespoon pumpkin pie spice

Ingredients for topping:
· 6 tablespoons cold butter
· 1 cups chopped pecans (or crushed gingersnaps)
· ¼ cup sugar
· 1 teaspoon cinnamon
· Whipped cream for garnish, if desired

Directions:
1. Preheat oven to 350 degrees.
2. Set aside ¾ cup of the cake mix. Combine the remaining mix with butter and egg until crumbly. Spread into a greased 13x9 inch baking pan.
3. Whisk filling ingredients until smooth, pour over crust.
4. For topping, cut butter into the reserved cake mix until crumbly. Stir in pecans (or gingersnaps), sugar and cinnamon; sprinkle over the filling.
5. Bake for 60-65 minutes or until a knife inserted near the center comes out clean. Cool.
6. Garnish with whipped cream, if desired.