Preheat oven to 350°F (175°C) and grease a 9x9 inch baking dish.
In a large bowl, whisk together the mashed bananas, egg, milk, maple syrup, and vanilla extract until well combined.
Stir in the oats, baking powder, cinnamon, and salt.
Gently fold in 1 cup of the sliced strawberries.
Pour the mixture into the prepared baking dish and spread evenly.
Top with the remaining 1/2 cup of strawberries.
Bake for 30 to 35 minutes, or until the top is golden brown and the center is set.
Allow to cool for 5-10 minutes before serving.