Combine yogurt and soda. Use a big bowl - it foams.

Mix oil, sugar, eggs, and bran. Add yogurt.

Add flour, baking powder, and salt. Fold in fruit.

Raisins are good with strawberry or raspberry yogurt. Otherwise, match
yogurt to fruit.

*Note: At work (where I got this), my boss saves up odds and ends of
yogurt all week, and she dumps them all together to make this
brown-looking mess of yogurt. It doesn't taste different in the
muffins, though, and you can toss in any kind of fruit with it.

Janet Templeton's recipe.