Sweet Potato Casserole with Carmelized Apples

4 large sweet potatoes
2 T. butter, divided
2 T. olive oil, divided
2 T. heavy cream
1/2 c. applesauce
2 t. grated ginger
1 t. lemon zest
1 t. salt
1 t. pepper
2 Honey Crisp or Fuji apples, cored and sliced (peel if desired)
3 t. light brown sugar

Boil sweet potatoes in skins until soft. Remove skins and mash flesh together with 1 T. butter, 1 T. oil, and cream. Beat with mixer until smooth, about 2 minutes. Add in the applesauce, ginger, lemon zest, salt and pepper. Place in sprayed 4 qt. baking dish. Combine apples and brown sugar. Place remaining butter and oil in pan. Add apples and saute, stirring occasionally until carmelized and golden brown, about 15 minutes. Place on top of sweet potatoes. bake 10-15 minutes or until warmed through. Serve hot.