Preheat the oven to Gas 4, 180°C, fan 160°C.
Peel and core the apples using an apple corer. Cut into thick rounds and arrange in a baking dish.
In a separate bowl, mix all dry ingredients and rub the margarine into the mixture.
Drizzle over the milk and stir to form a crumbly mixture.
Scatter the topping over the apple slices.
Cover with foil and bake for about 40 minutes.
Remove the foil and bake for a few more minutes until golden and the apples are soft.
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