Ingredients:

For the cake:

• Flour: 150 g (1 ½ cup)
• Water: 100 ml (½ cup)
• Milk: 100 ml (½ cup)
• Butter: 80 g (1/3 cup)
• Eggs: 4
• Baking Powder: 1 teaspoon
• Salt: ½ teaspoon

For the creamy filling:

• Milk: 500 ml
• Sugar: 150 g (1 ½ cup)
• Flour: 100 g (1 cup)
• Eggs: 2
• Butter: 180 g (3/4 cup)

Instructions:

1. Preheat your oven to 180°C (350°F) and grease a cake pan.
2. In a mixing bowl, combine flour, baking powder, and salt.
3. In a saucepan, heat water, milk, and butter until the butter melts.
4. Remove from heat and let it cool slightly.
5. Beat eggs and gradually add them to the dry ingredients, mixing well.
6. Slowly pour the milk mixture into the flour mixture, stirring until smooth.
7. Pour the batter into the prepared cake pan and bake for about 25-30 minutes, or until a toothpick inserted into the center comes out clean.
8. While the cake is baking, prepare the creamy filling.
9. In a saucepan, whisk together milk, sugar, and flour until smooth.
10. Cook over medium heat, stirring constantly, until the mixture thickens.
11. In a separate bowl, beat the eggs and then gradually add them to the thickened milk mixture, stirring continuously.
12. Cook for a few more minutes until the mixture reaches a pudding-like consistency.
13. Remove from heat and stir in the butter until melted and well combined.
14. Let the creamy filling cool completely.
15. Once the cake has cooled, slice it horizontally into two layers.
16. Spread the creamy filling evenly over the bottom layer and place the other layer on top.
17. Serve and enjoy your delicious, melt-in-your-mouth cake with creamy filling!