I tweaked this a bit from a Cadbury’s recipe. It makes about 10 sensible muffins.
Mix it all well in a big bowl – no lumps (except for choc chips!). Put muffin cases into a muffin tray and scoop some mixture into each one. I think it works best if you fill to about 1cm from the top of each case. Oven 180 °C for 20 mins tops. I like to turn the tray half way through to make sure they cook evenly. Eat at least one while they’re still warm.