Ingredient for Pecan Struesel

1/4 cup unsalted butter

1/2 cup finely chopped pecans

1/4 cup butterscotch chips

1/3 cup miniature marshmallows

1/3 cup brown sugar, firmly packed

Ingredient for cake

1 cup unsalted butter

2 1/2 cups sugar

5 eggs

1 tablespoon pure vanilla extract

2 cups mashed sweet potatoes

1 cup evaporated milk

1/2 teaspoon salt

1/2 teaspoon cinnamon

1/2 teaspoon pumpkin pie spices

4 teaspoons baking powder

1 teaspoon baking soda

4 half cups all-purpose flour

1 cup chopped pecans

1/3 cup unsalted butter

3/4 cup brown sugar

1 teaspoon vanilla extract

3 tablespoons bourbon

caramel topping

Marshmallow Fluff, warmed

toasted pecans