Pre-heat oven to 350F/180C. Grease and flour, spray or line an 8 inch cake pan with parchment paper. (I used a springform pan)
FOR THE APPLE FILLING
In a large pot add the butter and melt add the brown sugar, apples and cinnamon, stir to combine, continue to cook for approximately 10-15 minutes, stirring often, add the cornstarch and continue to cook 3-5 minutes or until thickened, a little juice should remain. Remove from the heat and let cool 20-30 minutes.
FOR THE CRUMB CRUST
In a large bowl whisk together the flour, sugar, baking powder and the salt. Add the butter and combine to form a coarse crumb mixture, add the egg and combine, the mixture should still be crumbly.
Add ½-⅔ of the crumb mixture to a lightly grease and floured or spray an 8 inch cake pan, gently press done. Pour the cooled apple filling on top, sprinkle with the remaining crumbs. Bake for 30-40 minutes or until lightly golden on top. Let cool in pan 15 minutes then move to a wire rack to cool completely or serve warm with a scoop of vanilla ice cream. Enjoy!
Notes
Types of apples to use
I love tart apples for the sweet filling such as Granny Smith apples. Gala apples, Fuji or Pink Lady can be used or even a sweet apple like a Honeycrisp.
How to Store an apple crumb cake
Store: Store apple crumble cake in an airtight container at room temperature for 2-3 days. For longer storage, store in the refrigerator for up to 5 days. Bring to room temperature before serving or warm up slightly in the microwave. Freeze: Cool completely then wrap slices in plastic wrap and store in a freezer safe bag or container for up to 2-3 months. Thaw overnight in the refrigerator, bring to room temperature and enjoy!