In a large mixing bowl, beat the heavy whipping cream on medium-high speed until soft peaks form, about 2-3 minutes.

Add mascarpone cheese, powdered sugar, and vanilla extract to the bowl of whipped cream. Gently fold until it reaches stiff peaks.

Arrange a layer of ladyfingers at the bottom of a 9x13-inch dish.

Brush half of the orange juice over the ladyfingers to moisten them.

Spread half of the mascarpone mixture over the moistened ladyfingers, adding sliced bananas on top.

Repeat the layering with the remaining ladyfingers, orange juice, mascarpone mixture, and bananas.

Spread Cool Whip over the top of your assembled dessert.

Cover with plastic wrap and refrigerate for at least 4 hours or overnight.