Make the Pie Crust: Mix flour and salt, cut in butter, add ice water until dough forms. Chill 30 min.
Roll and Bake: Roll dough to 12-inch circle, fit into pie plate, trim and crimp edges. Prick bottom.
Blind Bake: Line with parchment, add pie weights, bake at 375°F (190°C) for 20 min. Remove weights, bake 10–15 min more until golden. Cool completely.
Make Custard Base: Whisk sugar, cornstarch, and salt in saucepan. Gradually whisk in milk and cream.
Cook Custard: Stir constantly over medium heat until thick and bubbling. Reduce heat, cook 1–2 min more.
Temper Eggs: Whisk yolks, slowly add hot custard, then return mixture to saucepan. Cook 1–2 min until glossy. Stir in vanilla.
Chill Custard: Transfer to bowl, cover with plastic wrap directly on surface. Chill 3 hrs or overnight.
Prepare Bananas: Slice and toss with lemon juice.
Assemble Pie: Spread thin custard layer in crust, add bananas, top with remaining custard.
Whipped Cream: Beat cream and powdered sugar until stiff peaks form.
Top & Serve: Spread or pipe whipped cream over pie. Chill 30 min before serving.