Homemade Vanilla Slice is a magical dessert that combines crisp, flaky pastry with luxuriously creamy custard. The custard is cooked on the stove, infused with vanilla bean or extract, and thickened to a rich, smooth texture. Once assembled and chilled, the slice is dusted with powdered sugar and cut into squares for a dessert that's as elegant as it is indulgent. Beware: this one is completely irresistible!