Hi Maria- Unfortunately, there is no good way to convert this recipe to work with the baking mix as that is a blend of ingredients that you won't be able to properly imitate since we do not have the proportions of all the various specialty ingredients contained in the mix. We also do not recommend trying to add pumpkin into the muffin mix as it was very carefully balanced as is and the pumpkin puree would disrupt that balance and significantly change the resulting texture of the muffin. I would recommend using this recipe instead to make up pumpkin muffins as it is already balanced to work well with the multi-purpose flour: http://www.kingarthurflour.com/recipes/gluten-free-pumpkin-cake-bars-recipe. I hope that helps and if you have any more questions, please feel free to contact our Baker's Hotline at 1-855-371-2253. Happy Baking! Jocelyn@KAF

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