Gas mark 5, the time depends on the size of the muffins. It took me about 25 mins because they are tiny, truffle-size. If you do it in a size of a regular muffin, then would probably be 35 -40 mins. After the suggested time, poke it with a knife or fork and make sure they come out clean. also press on the top of bread with your finger- when ready, it should spring back straightaway