Servings: Makes 1 large casserole or 8 1-cup servings
Preheat oven to 400°. Melt margarine in a medium-size saucepan. Add flour and cook over medium heat, about 5 minutes, stirring occasionally until a thick paste forms and the mixture become golden but not brown. Add chicken broth and heat until mixture just begins to boil. Reduce heat; add turkey, sweet potato puree. Pour into a 2-quart casserole dish or divide among 8 1-cup ramekins.
For topping, in a large bowl, combine all ingredients until a soft batter forms. If using individual ramekins, spread batter on top of each ramekin. Place ramekins onto a cookie sheet and bake until dough is golden brown, approximately 12 to 15 minutes.
For the casserole, spread batter to cover. Bake until dough is golden brown, approximately 15 minutes.