Preheat the oven to 350F then line a baking sheet with parchement pape and set aside.
Cream the butter, oil, Imperial Sugar granulated sugar, and Imperial Sugar powdered sugar in a large mixing bowl or in a stand mixer.
Add the egg, and vanilla butter emulsion and mix until combined.
Add the flour, salt, and baking powder and mix until combined, using a large cookie scooper, scoop out 9 equally sized cookie balls, place them on the prepared baking sheet, gently flatten them to about 1 inch in thickness, then using a ¼ measuring cup, press down the center of the cookie to make a well for the filling.
Bake for 10 minutes then cool on the baking sheet fully.
Once the cookies are cooled, top with the banana pudding mixture, Nilla wafer crumbs, and a mini Nilla wafer in the center, and enjoy!