How to convert a muffin/cupcake recipe to a large muffin recipe I'm looking at the side of my "breakfast - O - meal" box at a recipe for 12 muffins. The kind you would use with a standard muffin tin. What kind of variation should can I use to make the recipe work in a larger 6 large muffin tin?

I tried this once before with corn bread muffins and they never seemed to be able to bake all the way though. Ideally I would like to try this with some other cupcake / muffin recipes I have too.

So what's the secret? Less liquid? More Egg? My underused large muffin tin needs to know.
This table comes from the front of the muffin section in Bread, by Beth Hensperger:

Muffin size          Baking time     Yield
Mini/gem (1 5/8")    10-15 minutes   18-20
Regular (2 3/4")     20-25 minutes   9-10
Oversized (3 1/4")   25-30 minutes   6-7
Muffin cake (8-9")   55-65 minutes   1


The baking times are for 375-400°F; most recipes will fall around that range. Note that the yields don't necessarily match up to typical pan sizes; for example, if you take a recipe meant for 12 regular muffins, you'll probably have more batter than you need for a pan of 6 oversized muffins. Perhaps this is your problem - you could be overfilling. If even after scaling the volumes appropriately, you still have problems, you could try reducing the temperature by 25°F and increasing the baking time.

("Muffin cake" refers to baking in an 8-9" pan of some sort - the author says that you can get away with it for any muffin recipe, but I've never tried it!)