Prepare the Cake – Bake the vanilla cake according to the package instructions in a 9x13-inch pan. Let it cool slightly.
Poke the Holes – Using the end of a wooden spoon, poke holes evenly across the cake, making sure they go deep into the cake.
Make the Pudding – In a mixing bowl, whisk together the orange pudding mix and milk until smooth.
Fill the Cake – Pour the pudding mixture over the cake, ensuring it seeps into the holes. Refrigerate for at least 1 hour to set.
Top with Whipped Topping – Spread the whipped topping evenly over the chilled cake.
Decorate and Serve – Sprinkle with Easter sprinkles and orange zest for a festive touch. Slice and enjoy!