Preheat the oven at 170ºC conventional oven and prepare 3 x 20 cm baking pan with parchment paper.
Sift together the all-purpose flour, almond flour, baking powder, baking soda and salt and set it aside.
260 g all-purpose flour, 100 g almond flour, 2 teaspoon baking powder, 0,5 teaspoon baking soda, 1 teaspoon salt
Mix together the buttermilk and vanilla extract and set it aside.
240 g buttermilk, 2 teaspoon vanilla extract
In a mixing bowl, use the paddle attachment add the butter, vegetable oil, and granulated sugar and mix it on high speed for 3 min.
180 g butter, 65 g vegetable oil, 330 g granulated sugar
Scape down the sides of the bowl and add the eggs one at a time into the mixture and mix it in until combined.
4 eggs
Continue by alternating between adding ⅓ of the flour mixture and ½ of the milk mixture, ending on the flour mixture. Mixing in each addition until just combined.
Divide the cake batter into the 3 prepared 20 cm baking tins and bake them for 22-25 min or until a cake tester comes out clean.
Let the cakes cool on a cooling rack. After 10 min, gently remove the cake from the cake tin and let the cakes cool down completely.