For the crust: Add together sugar, butter, and crushed corn flake cereal crumbs. Press firmly into the bottom and sides of a 9 inch pie plate. Bake at 350 degrees about 7 -9 minutes. Let cool before adding pie filling.
Filling: Lightly and slowly mix the Greek yogurt until all clumps are gone. Mix in sweetened condensed milk. Pour the mixture into the prepared crust and bake at 350 degrees for 25 minutes.