Sweet Potato Pie

I can't believe it's taken me this long in my lifetime to try a dish like this.  It's wonderful!  Thanks mom for the recipe.   
3 lbs. sweet potatoes, cooked and mashed
1 egg
½ cup sugar
½ t. cinnamon
2 ½ T. butter, melted
dash of salt

Topping:
½ cup ritz crackers, crushed
2 ½ T. butter, melted
¼ cup chopped pecans
½ cup brown sugar

Bake in 9 or 10 “ pie plate at 350 for 30 minutes.