Pillsbury Moist Supreme Devils Food cake mix
I didn't want to make the whole box of cake so I used:
1/2 bag of cake mix
1/4 cup oil
1 cup club soda
= 10 cupcakes. They turned out great.
Much better tasting and moist without being chewy. They are fragile when hot, but firm up when cool. Making 20 servings per cake mix brings the phe to 45 mg per cup cake or 3 exchanges. The oil really added flavor and moisture. I haven't made this in a regular cake pan yet, but it should work because the cupcakes are fine.