Cornflake, Pecan, and Marshmallow-Topped Sweet Potato Casserole

INGREDIENTS

SWEET POTATO FILLING:

2 1/2 lb

sweet potatoes (about 5 medium)

2 tbsp

butter, softened

1/2 cup

firmly packed brown sugar

1/2 cup

2% reduced-fat milk

large egg

1/2 tsp

salt

1/2 tsp

vanilla extract

Vegetable cooking spray

CORNFLAKE, PECAN, AND MARSHMALLOW TOPPING:

1 1/4 cups

cornflakes cereal, crushed

1/4 cup

chopped pecans

1 tbsp

brown sugar

1 tbsp

melted butter

1 1/4 cups

miniature marshmallows