melt butter in microwave. mix sugar and crumbs together in a bowl. add melted butter. mix until crumbly. pour into 8 or 9 inch pie plate. press crumbs to bottom and up sides of pan. bake 10 minutes in 350 degree oven. cool.
in blender, or food processor, add sweetened condensed milk, avocados and lemon juice. blend until smooth. pour into prepared crust. refrigerate for at least 3 hours. serve with whipped cream garnish.