In a mixing bowl, combine the vanilla sugar-free pudding, vanilla protein powder, and vanilla extract. Stir until well incorporated and smooth.

Gently fold the whipped topping into the pudding-protein mixture. Ensure a light and airy consistency by gently folding to preserve the fluffiness.

Take your chosen serving container (glass dish or individual serving cups work well) and start the layering process.

Begin by placing a layer of animal crackers at the bottom of the container. You can also break them into smaller pieces for easier layering.

Add a layer of the prepared vanilla protein mousse on top of the crackers.

Continue alternating layers of animal crackers and the protein mousse until the container is filled, ensuring the final layer is the mousse.

Cover the container with a lid or plastic wrap and refrigerate the mousse for at least 2 hours, allowing it to set and the flavors to meld together.

Once sufficiently chilled, remove the mousse from the fridge.

Optionally, garnish with a sprinkle of crushed animal crackers or fresh fruit before serving.