How to make marble poppy seed cake step by step

Step 1 - preparations

• Line the baking pan with baking paper, or grease with butter and sprinkle with flour or breadcrumbs.
• Preheat the oven to 180℃ (top/bottom heat mode).
• Sift together through a sieve flour, ground almonds, and baking powder.
  250 g all-puropose flour, 2 teaspoons baking powder, 50 g almonds
  

Step 2 - preparing the creamed cake batter

• Mix together butter, sugar, and oil until fluffy and light - I mix for several minutes at maximum mixer speed.
  200 g powdered sugar, 120 g butter, 40 g oil
  
• Add eggs one by one and after each, mix very briefly on low speed - just until combined.
  4 eggs
  
• Add about half of the sifted flour and mix briefly.
  
• Pour in the milk and mix briefly.
  150 ml milk
  
• Add the rest of the flour and mix briefly - just until combined.

Step 3 - preparing the poppy seed batter

• Transfer a little over 1/3 of the batter to a bowl.
• Add ground poppy seeds and milk to the reserved batter.
  90 g poppy seeds, 45 g milk
  
• Mix until combined.

Step 4 - placing the batter into the pan

• Spoon portions of both batters, creating patches.
  
• Finally, swirl the batter with a knife or a skewer.
  

Step 5 - baking the marble poppy seed cake

• Place the cake into the preheated oven and bake for about 70 minutes - until a toothpick inserted comes out clean.
• After baking, cool the cake.