I made my first packaged easy-prep mix last weekend. :-) It turned out REALLY well and even my picky husband liked the finished product.
One bag of mix makes 1 dozen muffins, and all the baker has to add is 3/4 cup natural (sugar free/unsweetened) apple sauce, 1/4 cup canola oil, 1/4 cup rice milk, and about 1 cup of strained canned blueberries (I used a little less because I had already used a couple spoonfuls in my pancakes that morning). This mix is: wheat-free, egg-free, dairy-free, soy-free, corn-free, nut-free, etc. :-) It is a really great universal allergen-free muffin mix.
If any of my friends would like to try this (or other future mixes), just write me an email and I'll send one off. If I don't know you, leave me a comment and I'll try to keep checking the comments on my *mix* posts frequently.