Preheat oven to 400 degree F (200 degree C). Lightly grease or spray with a non-stick spray a 9 -inch (23 cm) deep-dish glass pie plate or a 8-inch (20 cm) glass baking dish.
In a bowl, combine flour and sugar; which in eggs and vanilla until blended. Gradually whisk in milk until frothy. Set aside.
Cut bananas into thin slices and place in a bowl with lemon juice. Toss gently to coat in juice. Arrange banana slices in the bottom of prepared baking dish, overlapping slightly. Gently pour milk mixture over top of bananas.
Bake in preheated oven for about 25 minutes or until top is golden brown and centre is puffed. Let cook on a wire rack for 15 minutes. Serve warm or let cook completely.