Nigella Lawson’s marshmallow crispy squares are an easy, classic treat for the family

Melt the butter in a large saucepan over low heat. Add in the marshmallows, and cook gently until they are melted and blended, stirring constantly.

Take the pan off the heat, and immediately mix in the cereal. Stir lightly until coasted.

Press the mixture into a greased 32-cm-by-32-cm pan. With clean hands or gloves, make sure it’s pressed down in the corners. The mixture will be very sticky.

Flatten the top and scatter on the sprinkles or edible glitter. Let cool, then cut into 24 squares.