Mix flour and mulling spices and set aside.
At low speed of mixer, blend oil, sugar and brown sugar until well blended and then add in eggs, sweet potatoes and milk blending until well blended.
Add wet ingredients into dry ingredients and blend until all ingredients are moist.
Line 12 muffin cups with paper liners or spray with baking spray, such as Bakers Joy.
Fill muffin cups ¾ full and sprinkle with crumb topping, pressing crumbs lightly into batter.
Bake at 350 degrees for 18-22 minutes or until finger pressed into center of muffin bounces back.
Cool for about 5 minutes in pan and then remove and drizzle with praline glaze, if desired.