Line the pan with greaseproof paper.
greaseproof paper
Line the base of the dish with greaseproof paper and lightly grease the sides.
Vegetable parchment, greaseproof papers, tracing papers and glassine and other glazed transparent or translucent papers, in rolls or sheets.
The best way to do this is with butter-smeared greaseproof paper - the kind butter is wrapped in.