Preheat oven to 350°F (175°C).
Mix crumbs, sugar, and melted butter; press into a 9-inch pie plate.
Bake crust for 10 mins; let it cool.
Combine sweetened condensed milk, sour cream, lime juice, and zest.
Pour the lime mixture into the crust.
Bake for 5-8 mins; avoid browning.
Chill before serving. Optionally, garnish with cream and lime slices.