In a large glass bowl, beat heavy whipping cream with a hand mixer until firm peaks form (about 6 minutes). Transfer to a piping bag with a star tip.
In a medium bowl, prepare banana instant pudding by mixing with 2 cups whole milk. Let it set for 5 minutes.
Place mini graham cracker pie shells on a flat surface.
Spoon 2 tablespoons of banana pudding into each shell.
Slice bananas into thin rounds and place 5 slices on each pie.
Sprinkle graham cracker crumbs over the banana slices.
Pipe whipped cream onto the center of each pie.
Garnish with extra graham cracker crumbs and a banana slice.
Store in the refrigerator and serve within 2 days for best freshness.