Preheat the oven to 325 degrees F. Grease and flour a standard Bundt pan.(the 12 cup capacity)
In a medium bowl, whisk together the flour, cornstarch, baking powder and salt then set aside.
Using an electric mixer on medium speed with a paddle attachment, cream together the butter and granulated sugar until light and fluffy, about 2-3 minutes.Add in the banana pudding mix and mix on low for 3-4 minutes to dissolve the pudding mix.
Beat in the eggs, one at a time, making sure each is thoroughly incorporated.
Combine the milk, oil and vanilla extract in a large measuring cup or bowl.
Starting with the dry ingredients, alternate pouring a third of the wet and dry ingredients into the bowl, incorporating thoroughly after each addition. You will end on the wet ingredients. Mix on medium speed for 2 minutes after the last addition.
Pour the cake batter into the prepared Bundt pan and bake for 50 to 60 minutes, or until a tester inserted into the center of the cake comes out clean.
Invert the cake onto a baking rack to cool.
Mix together the glaze ingredients until smooth & drizzle over the cake, once it's completely cool.
Top with fresh banana slices right before serving and enjoy!