Line an 8×8-inch (20 cm) pan with parchment paper, leaving overhang on all sides for easy removal later. Set aside.
Measure out 10 cookies for the ice cream filling and 35 cookies for the coating, and set them aside in separate bowls.
Crush the Oreos using a food processor for fine crumbs or a zip-top bag and rolling pin for a chunkier texture. Both methods work well.
Mix 35 crushed Oreos with melted butter until evenly coated. Press half into the pan to form the crust. Place it in the fridge
In a large chilled mixing bowl, whip the cold heavy cream to medium peaks using whisk attachment; this step incorporates air, which keeps the ice cream light and creamy.
When medium peaks form, pour condensed milk in a steady stream, vanilla, and a pinch of salt. Whip until stiff peaks hold their shape.
Gently fold in 10 crushed Oreos and chocolate chips with a spatula to keep the mixture fluffy. Work slowly and carefully to avoid deflating the mixture, which is what gives the ice cream its fluffy, no-churn texture.
Pour ice cream mixture over crust, spread evenly, then top with remaining crumbs and press gently to stick.
Cover the pan with foil or plastic wrap and place it in the freezer overnight, or at least until fully firm.
When ready to serve, use the parchment paper overhang to lift the entire block out of the pan. Place it on a cutting board, slice into bars with a sharp knife, and enjoy straight from the freezer.
These bars are best served cold and keep well in an airtight container in the freezer.