Creating a stunning Sweet Banana Pudding Cake is easy by following these step-by-step instructions:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans to prevent sticking.
2. Mix Dry Ingredients: In a large bowl, combine the flour, baking powder, baking soda, and salt. Whisk together until well combined.
3. Cream Butter and Sugar: In another bowl, beat the softened butter and granulated sugar until light and fluffy, roughly 2-3 minutes.
4. Add Eggs and Vanilla: Incorporate the eggs, one at a time, beating well after each addition. Add vanilla extract and mix until combined.
5. Combine Mixtures: Gradually add the dry ingredient mixture to the butter mixture, alternating with the whole milk. Mix until smooth.
6. Fold in Bananas: Gently fold in the mashed bananas until evenly distributed throughout the batter.
7. Divide Batter: Pour the batter evenly into the prepared cake pans, ensuring an equal distribution.
8. Bake: Place the pans in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool the Cakes: Once done, remove the cakes from the oven. Allow them to cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely.
10. Prepare Pudding: While the cakes are cooling, prepare the instant vanilla pudding by whisking the pudding mix with 2 cups of cold milk in a separate bowl. Let it set according to package instructions.
11. Layer the Cake: Once the cakes are completely cool, place the first layer on a serving platter. Spread a layer of pudding over the cake, then top with whipped cream.
12. Add the Second Layer: Carefully place the second cake layer on top of the pudding and whipped cream. Repeat the topping process with the remaining pudding mix and whipped cream.
13. Garnish: If desired, add crushed vanilla wafers and banana slices on top for decoration.
14. Chill Before Serving: For optimal flavor and texture, let the cake chill in the refrigerator for at least 30 minutes before serving.

These steps will guide you in creating a spectacular Sweet Banana Pudding Cake that is both delightful and delicious.