Apple and Banana Baked Oatmeal

oats 1 teaspoon baking powder 1 1/2 teaspoons cinnamon 1/2 teaspoon salt 1/3 cup maple syrup 1/2 cup pecans 2 cups milk 1 tsp vanilla extract 1 egg 2 apples, peeled and sliced 2 banana, peeled and sliced