To prepare the pie crust, put flour, sugar and salt in the food processor fitted with the dough blade and pulse a few times to mix.
Cube the butter and add to the flour mixture. Make sure butter is cold. Pulse several times until butter is about pea size and mixture resembles coarse crumbs.
Add cold water, 1 tablespoon at a time, and pulse until the dough starts to pull together. Be mindful not to overmix, you still want chunks of butter in the dough to create a flaky crust.
Turn the dough out on a lightly floured board and shape into a disk. Wrap in plastic and rest in the refrigerator for an hour.
Roll the dough into a square about 1/8” thick, it will be about 11”x11”. Cut into four smaller squares. Carefully place the dough squares into 4 mini pie pans (I used disposable tins). Trim the edges to fit the pans, crimp with a fork for flute with your fingers.
Wrap all four pie pans in plastic and place in the freezer while you preheat the oven.
Preheat the oven to 400°F.
Take pie pans out of the freezer. Place a piece of foil over the dough, wrap the foil to cover the edge of the pie as well. Place dry bean over the foil, press the beans into the side of the pie pan to keep the side of the crust in place during blind baking.
Place the mini pies on a baking sheet and bake for 15 minutes. Then carefully remove foil and dry beans. Bake for another 10 minutes uncovered to brown.
Remove from the oven and let cool completely on a cooling rack before adding filling.
For the filling, slice the banana to 1/8” slices, place in a bowl and mix with 1 tsp of the lemon juice to prevent browning.
Use a kitchen scale to measure half of the instant pudding mix, about 1.7 oz. Mix with 1 cup of cold milk in a small mixing bowl, whisk until thicken, refrigerate.
In another mixing bowl, add the heavy whipping cream, 1/4 cup of sugar and vanilla extract, whisk on medium-high to high speed until stiff peak forms.
Fold 1 cup of whipped cream into the banana pudding using a spatula until smoothly combined.
Pour about 1/4 cup of the pudding mix into each pie, add a layer of sliced banana (5-6 slices), pour another 1/4 cup of pudding mix on top of the banana slices.
Add the remaining whipped cream into a pastry bag, pipe whipped cream on top of the pudding filling. Top off with another slice of banana.