Preheat oven to 375 degrees F and generously spray the inside of a 10-1/2 by 7 inch baking dish with cooking spray and place on a baking sheet.
In a large bowl, mix together the oats, sugar, baking powder, orange zest, Chinese five spice, salt, half the walnuts, half the strawberries and half the chocolate. (Save the other half of strawberries, walnuts and chocolate for the top of the oatmeal). In another large bowl, whisk together the milk, egg, butter and vanilla extract.
Add the oat mixture to prepared baking dish. Arrange the remaining strawberries, walnuts and chocolate on top. Add the banana slices to the top then pour the milk mixture over everything. Gently shimmy/shake the baking dish to help the milk mixture go throughout the oats.
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