Preheat the oven to 190°C/ 170°C fan/ gas mark 5/ 375°F
Lightly grease the baking tray, optionally lining the base with a baking parchment square
For the crumb topping:
Melt the butter gently in a saucepan or in the microwave
Mix the flour, cinnamon, and both sugars in a medium bowl. Add the melted butter to the dry ingredients and mix well
Crumble with a fork.
For the apple layer:
Peel and core the apples. Chop into 1-2cm/1/2-1 inch pieces
Put apples into a bowl with the cinnamon and mix to coat the apple evenly.
For the cake:
Mix all the ingredients well with a mixer or food processor and process until combined
Spoon the mixture into the tin and smooth the surface (e.g. with a palette knife)
Put the apples on top. They should form a single layer
With your hands, sprinkle the crumb topping onto the apple, rubbing the topping slightly in your fingers to break it up and form a crumb. Press the crumb topping into the cake
Cook for 50 minutes, or until a cocktail stick comes out clean
Cool in the tin or serve immediately with cream or custard.
Notes
Everyday Cooks tip:If you don't want a cinnamon flavour, leave out the ground cinnamon and double the vanilla extract in the cake.Storage:Cut the struesel cake into squares when cool. They will keep for at least a week in an airtight container in the fridge.