Preheat the oven at 170ºC conventional oven and prepare 2 x20 cm baking pan with parchment paper.
Start by blending the pistachios into a flour-like consistency.
100 g unsalted pistachios
Sift together the blended pistachios, all-purpose flour, baking powder, baking soda and salt and set it aside.
260 g all-purpose flour, ¾ teaspoon baking powder, ¾ teaspoon baking soda, ¾ teaspoon salt
In a large bowl using an electric hand mixer or in a bowl of a stand mixer, add the butter, and granulated sugar and mix it on high speed for 3 minutes.
300 g granulated sugar, 180 g butter
Add the eggs two at a time into the mixture and mix it in until combined.
4 large eggs
Continue by adding half the dry ingredients, on low speed, mixing until just combined.
Then add the sour cream, vegetable oil, vanilla extract and mix until just combined. Then add the other half of the dry ingredients and mix until combined.
240 g sour cream, 60 g vegetable oil, 2 teaspoon vanilla extract
Using a rubber spatula, give the batter a gentle fold to make sure all of the ingredients have combined.
Pour the cake batter into the prepared pans and bake for 30-33 minutes or until a cake tester comes out clean.
Let the cakes cool on a cooling rack. After 10 minutes, gently remove the cake from the cake tin and let the cakes cool down completely.