Before You Start
In a large bowl, combine all the streusel topping ingredients. Crumble together until well combined. Set aside.
For the apple crisp, in another bowl combine apple mixture ingredients. Pour the apple mixture into a greased 23 cm square baking dish. Top with a generous amount of the streusel topping. Place on the wire rack set on position 2. Turn the convection steam oven on by selecting the Auto Steam Bake Mode set to 175°C. Bake until golden brown and bubbly. Approximately 45 minutes.