Preheat your fan oven to 160°C or 325°F. Grease and line with baking paper a 9x13 inch (23x32 cm) pan.
In a bowl of a standing mixer sift and combine flour, both sugars, salt, baking powder, cinnamon, nutmeg and cloves. Add butter and mix for a minute, until you get sand-like texture.
Add oil, eggs, greek yogurt and applesauce and mix everything until just combined. Don't overmix it. In the end, add vanilla extract.
Pour the batter into your prepared baking pan and spread it evenly using an offset palette knife. Bake for 45-50 minutes or until it's springy on the top and the skewer inserted in the middle comes out mostly clean - with just a few crumbs.Once it's done, let it cool in the pan on the cooling rack for approx. 30 minutes, before removing it from the pan and allowing it to cool completely.
Cook frozen blackberries with sugar and lemon zest over a medium-high heat, until it reaches boiling. Turn the heat down and let it simmer for approx. 15 minutes or until it thickens. It’s better to be thicker than looser, the plan is to lose a lot of water content and have concentrated flavour. Strain the jam through a sieve to get rid of blackberry seeds and make it smooth and beautiful. Cover it with cling film and leave it to cool in the fridge.
blackberry mascarpone frosting
Using a stand mixer fitted with the whisk attachment, mix mascarpone, powdered sugar and blackberry jam until smooth and combined. Add cold heavy cream and mix until everything is nicely incorporated.
Put the apple spice cake on a serving plate or a wooden board. Spread the blackberry mascarpone frosting evenly, making some rustic swirls with the offset palette knife. Decorate with thinly sliced apples, blackberries, mint leaves and some spices.
You can use a hand mixer if you don't have a stand mixer.
If you still don't own one, I advise you to buy a kitchen scale - they're cheap and easy to use, and always guarantee the same results in baking! :)
Not all ovens are the same. I suggest to check the cake at 37-38 minute mark and then adjust the time accordingly.
The number of servings depends on how big/small you cut your cake, but it feeds approx. 20 people and the nutrition facts are calculated automatically with 20 as a max serving size.