Last Minute Sweet Potato Casserole (Lightened Up)

Cooking oil spray

cooked (, peeled and mashed sweet potatoes (*See Notes))

granulated sugar ((or a natural granulated sweetener))

low-fat milk

light butter (, melted)

pure vanilla extract

large eggs (, whisked)

salt to taste ((abut 1/2 teaspoon))

all-purpose flour

light brown sugar

melted butter

crushed pecans ((blitz in a magic bullet or food processor for a smoother crumb))