Preheat your oven to 350°F (175°C) to get the perfect, consistent baking temperature.
Prepare the crust: Mix the crushed chessman cookies, melted butter, and granulated sugar in a bowl until crumbly. Press the mixture firmly into the bottom of an 8-inch cake pan to create an even crust.
Bake the crust for 8 minutes until lightly golden, then let it cool while you move on to the filling.
Make the filling: Beat the cream cheese until silky and smooth. Slowly add sugar, salt, and vanilla, blending until fully incorporated.
Add the eggs one at a time, mixing in between to avoid breaking the emulsion.
Gently fold in sour cream and the mashed banana with a rubber spatula, ensuring there are no visible streaks.
Pour the filling over the cooled crust. Smooth the top with a spatula for a clean finish.
Bake for 20-25 minutes, or until the center is set but still jiggles slightly.
Remove from the oven and allow the cheesecake to cool to room temperature. Then, refrigerate for at least 4 hours (or overnight) to set completely.
Top with homemade whipped cream (or store-bought), along with sliced bananas and cookies for garnish before serving.