When I looked I couldn’t find any just add water muffin recipes online, so I made my own. I share it here for a starting point if anyone else is interested. First the recipe and then my comments:
1 3/4 cup Wholewheat pastry flour
1/2 cup sugar
2 1/2 tsp baking powder
1/4 tsp salt
2 1/2 Tbsp ova easy egg powder
1/3 cup butter powder
You will end up with about 3 cups of mix (400 grams). 3/4 cups of mix with a 1/4 cup of water will make 2 big muffins. This is of course just a standard muffin recipe. Add-ins are important! Freeze dried blueberries are good but you need to add a bit more water. Another popular option at my house is to add a Tbsp of beet powder and chocolate chips.
You could of course just buy Jiffy Muffin Mix, but I like to be able to control the ingredients. I started with a standard Betty Crocker muffin recipe and just substituted egg, milk, and butter powder. The result wasn’t as rich as I was hoping for. I think the main reason is butter powder and water doesn’t have nearly as much fat as the oil the recipe calls for. The recipe ups the amount of butter powder and I cut out the milk powder. Its very good, but I think next time I will try even more butter and egg powder (maybe 1/2 cup and 3 Tbsp).
Here are some links for the non-standard items: Whole wheat pastry flour
Butter powder: http://www.amazon.com/Hoosier-Hill-Farm-...s=butter+powder
Egg powder: http://www.amazon.com/Ova-Easy-Egg-Cryst...ywords=ova+easy Beet juice powder
Beet powder can be found much cheaper, but the vast majority of it comes from Asia. This stuff is made from beets grown in the US (may or may not be important to you).