Preheat the oven to 350 degrees. Butter or grease a 9-inch pie plate.
Grind the cookies into fine crumbs using a food processor. Combine with melted butter and mix well. Firmly pack the mixture into the prepared pie plate, making sure to come up the sides of the pan. Bake for 8 minutes. Leave the oven on.
Whisk together the sweetened condensed milk, lemon juice, and egg yolks. Pour into the warm crust and bake for an additional 18-20 minutes or until the filling is set. Let cool on a wire rack, then refrigerate for at least 1 hour.
Garnish with optional garnishes, if desired, and serve.