Delightfully Easy Bake Yellow Cake with Custard Mix Surprise

Ingredients

• 2 cups (240g) all-purpose flour
• 1 ½ cups (300g) granulated sugar
• ½ cup (115g) unsalted butter, softened
• 1 cup (240ml) whole milk
• 3 large eggs
• 1 tablespoon baking powder
• 1 teaspoon vanilla extract
• ½ teaspoon salt
• 1 package (3.4 oz or 96g) instant vanilla custard mix
• 2 cups (480ml) whole milk
• ¼ cup (50g) granulated sugar (optional, adjust sweetness to taste)