Prepare the Pan: Start by lining a 9x9" square pan with parchment paper to ensure easy removal of your delicious treats later on.

Crust Preparation: Crush the Oreo cookies into fine crumbs using a food processor or by placing them in a Ziploc bag and smashing them with a rolling pin. Set aside 100g of the crumbs and combine the remaining crumbs with melted butter until the mixture resembles wet sand.

Form Crust Layer: Press half of the Oreo mixture into the prepared pan evenly. Chill in the freezer for about 30 minutes to firm up.

Make Ice Cream Filling: In a large bowl, whip the heavy cream and vanilla extract until stiff peaks form. Gradually fold in the condensed milk until mixed well, then gently combine in the reserved Oreo crumbs.

Combine Layers: Pour the ice cream mixture over the chilled crust, smoothing it out evenly. Freeze for 1-2 hours until it's firm.

Add Top Crust: Spread the remaining Oreo crust mixture over the ice cream layer, pressing it gently. Freeze again for at least 6 hours, or overnight for best results.

Serving: Once completely frozen, lift the sandwich block from the pan and cut into 8 slices using a knife warmed under hot water. Serve immediately for a delightful treat!