Using a whisk, mix together your box of instant vanilla pudding and 2 cups milk.
Mix in your 14 ounce can of condensed milk, the eagle brand is the best if you can find it.
Add in your vanilla flavoring and cool whip, fold this in and whisk to combine.
Now you are ready to start layering your banana pudding. I like to go ahead and use a container I can store the pudding in such as a glass or plastic casserole dish with lid. Start by adding a layer of bananas, then wafers, and topping those with half the pudding mix.
Repeat with a second layer of bananas, wafers, and the rest of the pudding mix.
This is totally option and not necessary but I like to crumble a few wafers together and top the very top of the banana pudding. It makes it look finished, especially if you are serving this to your family and friends.