Original recipe here: my adaptations are in my notes, below.
1 1/2 cups whole-wheat flour
1 cup all-purpose flour
2 teaspoons baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1 1/3 cups buttermilk
1/4 cup canola oil
1/4 cup maple syrup
1 teaspoon vanilla
1 cup cooked steel-cut oats
1 cup blueberries tossed with 1 teaspoon flour
1. Preheat the oven to 375 degrees with the rack positioned in the upper third. Oil, spray or butter 12 muffin cups.
2. Sift together the flours, baking powder, baking soda and salt. In another bowl, beat together the eggs, buttermilk (or yogurt and milk), canola oil, maple syrup and vanilla. Quickly stir in the dry ingredients with a whisk or a spatula. Do not beat, just mix, stirring up from the bottom until you can no longer see flour. A few lumps are fine. Fold in the cooked oats and the blueberries.
3. Spoon into muffin cups, filling them to just below the top. Place in the oven, and bake for 20 to 25 minutes until nicely browned. Remove from the heat, and allow to cool for 10 minutes before unmolding. Cool on a rack, or serve warm.
Yield: Twelve muffins, depending on the size of your muffin tins.
I had to make a bunch of adaptations, as I didn't have canola oil, maple syrup, or buttermilk on hand. Instead I melted 1/4 cup butter, substituted honey for the maple syrup, and used yogurt instead of buttermilk. I also doubled the amount of vanilla extract (because I always like more than recipes specify) and mixed in two cups of blueberries (because one seemed paltry). They baked up beautifully in the same amount of time as specified above, and they're delicious - the steel-cut oats make for a slightly nutty taste, and adds to the whole-grain goodness. They're also really moist, which delighted me, as I've been searching for a good blueberry muffin recipe that didn't taste dried out within a day or so.