Pre-heat your oven to 375°F (190°C/170°C fan forced).
Peel, core and dice the pears. Add to the baking dish. Add the cinnamon and vanilla and mix well. Add the corn flour and mix well.
Bake pears in the oven for 30 minutes.
Melt the butter in a microwave proof bowl. In a separate bowl add the rolled oats, almond meal and brown sugar. Mix well, ensuring all the lumps of brown sugar are well mixed in. Add the melted butter and stir well.
Stir the softened pears well and add the crumble topping, leaving plenty of lumpy bits to go nice and crispy. Sprinkle with almond flakes if using.
Bake for twenty five minutes or until crumble topping is golden brown and delicious.
Remove from the oven and serve with custard or a scoop of vanilla or sour cream ice cream. Delicious!