Ingredients:
- 1 1/2 cups all-purpose flour
- 1/2 cup granulated sugar
- 1/2 cup unsalted butter, cold and cut into small pieces
- 1 teaspoon baking powder
- 1/4 teaspoon salt
- 1 egg
- 1 teaspoon vanilla extract
- 1/2 cup milk
For the custard filling:
- 2 cups milk
- 1/2 cup granulated sugar
- 4 egg yolks
- 1/4 cup cornstarch
- 1 teaspoon vanilla extract
Instructions:
- Preheat the oven to 350°F (175°C) and grease a 9-inch square baking dish.
- In a large bowl, combine the flour, sugar, baking powder, and salt. Cut in the cold butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs.
- In a separate bowl, whisk together the egg, vanilla extract, and milk. Gradually add the wet ingredients to the dry ingredients, stirring until just combined.
- Spread half of the crumble cake batter into the prepared baking dish, reserving the other half for the topping.
- To make the custard filling, heat the milk and sugar in a saucepan over medium heat until steaming but not boiling.
- In a separate bowl, whisk together the egg yolks and cornstarch until smooth. Gradually pour the hot milk mixture into the egg yolk mixture, whisking constantly.
- Return the mixture to the saucepan and cook over medium heat, stirring constantly, until the custard thickens. Remove from heat and stir in the vanilla extract.
- Pour the custard filling over the batter in the baking dish.
- Crumble the remaining batter over the top of the custard filling.
- Bake for 30-35 minutes, or until the top is golden brown and a toothpick inserted into the cake comes out clean.
- Allow the crumble cake to cool slightly before serving. Enjoy your delicious crumble cake with custard filling!
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