Here is another recipe from work. March is Blueberry Muffin month, and this is the recipe we use. It's not as good as my Ultimate Blueberry Muffin recipe, but it's OK, and apparently the customers like them. This is a variation of the master/basic muffin recipe and we use wild blueberries.
12 cups flour
6 tbsp baking powder
3 tsp salt
5 cups milk
4 cups brown sugar, packed
2 cups vegetable oil
6 tsp vanilla
4 cups blueberries
The usual muffin method applies. Bake at 350F for 25 minutes or so.
You can divide this by four and get an amount of batter suitable for home baking, but you might have to tinker a bit with the milk amount. I know I have to every so often when I make the large batch; I usually have to increase it.
Anyway, there you have it: Blueberry Muffins, commercial style.