I am making [these muffins](http://www.bbcgoodfood.com/recipes/1737/choccherry-muffins) but would like to freeze half the mixture - will this be ok or will it affect how they cook/rise/taste when I cook my second batch (from the frozen mixture)?

(Recipe contains - self raising flour, bicarb soda, golden caster sugar, chocolate, dried cranberries, butter, eggs, yoghurt)