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Heavily grease 2 eight inch spring form pans and 2 mini pans. (If you’re not making minis, just use 3 eight inch pans instead!). Place a circle of parchment paper on the bottom of each. Set aside.
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Toss apples with lemon juice, cinnamon & nutmeg. Set aside.
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In a large bowl, whisk oil with buttermilk and sugar. Add eggs, vanilla, cinnamon, baking powder, and baking soda, whisking until homogenous. Slowly add flour, mixing until just incorporated.
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Place about 200 g of mixture on the bottom of each 8 inch spring form pan, and 70 g in each mini pan.
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Top with apples.
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Divide remaining batter evenly over each pan.
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Bake at 350°F for about 45-60 minutes, until center is firm and cake is golden. Cool completely and freeze for 30-40 minutes before decorating.