Freezing potato mash made with root and fresh vegetables I regularly make homemade mash using the following ingredients 


Potatoes 
Sweet Potatoes 
Carrots 
Cabbage (2 varieties) 
Onion
Leek 
Butter
Cream 
Cayenne Pepper / Paprika 


This is the first time I have made a 4-5 litre batch and would like to freeze it.  Will it be safe to eat despite having fresh cabbage mashed into the recipe?
There isn't much you can't safely freeze, and your mash looks pretty straightforward to me. As long as you're following USDA safe freezing/thawing methods, I say, yes, freeze on!