Banana Cream Pudding Jars

For the pudding: 1/2 cup sugar 3 tablespoons cornstarch 1/8 teaspoon salt 1 1/2 cups milk 1/2 cup heavy cream 2 egg yolks 1 1/2 tablespoon butter, softened 1 teaspoon vanilla extract

For the rest: 1 1/2 cups vanilla wafers, coarsely chopped 1-2 ripe bananas, sliced 1 1/2 cups heavy cream + 1 tablespoon sugar, whipped