Mix custard powder, powdered sugar with milk in a bowl until well combined.
Put on heat and cook on low heat mixing well until well combined.
Put the custard in a bowl, cover with nylon and let it cool down.
Meanwhile, add butter and sugar in a mixing bowl, whisk until creamy in texture, then add the eggs one by one and continue whisking.
Add the flour, almonds and corn starch, fold together, until well combined. Then add the milk slowly folding in the mixture.
Put the mixture in a baking tin lined with parchment paper, add half of the batter mixture, then add the custard mixture and then finish with the batter.
Bake in a pre-heated oven for 40 minutes on 180 degrees.
Remove from oven and let it cool before putting on a wire rack. This Custard Cake is best served chilled and makes a very nice dessert.