But recipes are meant to be used as a guideline...
Break the rules! Make substitutions and experiment with different ingredients, or ones that you already have lying around for a customized recipe.
For the record...Google will be your best friend in this scenario! A simple search will provide a ton of different substitutes for eggs, flour, dairy and many other ingredients that vegan or gluten-free recipes often swap out.
Ps. What are your thoughts about peas in muffins? Yay or nay?