Whisk the chilled heavy cream until it thickens to a soft, ribbony consistency without reaching stiff peaks.

Add the sweetened condensed milk and continue whisking until the mixture becomes thick and holds stiff peaks without being overmixed.

Prepare your pan by lining it with parchment paper if you plan to remove the dessert later, or leave it unlined if serving directly.

Arrange a layer of cookies at the bottom, then spread a portion of the whipped cream evenly over the cookies.

Add a generous layer of mango pieces over the cream to create a fruity layer.

Repeat the layering process with cookies, cream, and mango for a second layer.

Finish with a final layer of cookies and cream, then top with mango slices and crushed cookies for decoration.

Cover the pan tightly and refrigerate overnight so the layers soften and set properly.

Slice and serve chilled, or freeze briefly for a firmer texture before serving.