Whole Wheat Banana Muffins

I saw this in Oprah's mag over the summer and just made them and inhaled 2 muffins. They are moist and delicious. The recipe is great, but the instructions got me in trouble! I have made some corrections and posted the recipe below.

1 cup whole wheat or all purpose flour ( I did 1/2 and 1/2)
1/2 tsp. baking soda
1/2 tsp. ground cardamom
1/2 tsp. ground cinnamon
1/2 tsp. ground nutmeg
1/4 tsp. salt

1/2 cup light brown sugar (I have dark brown and used that)
1/4 cup (1/2 stick butter) butter or veg oil (I used butter of course)
1 cup mashed very ripe bananas about 2-3
1/4 cup unsweetened applesauce
1/2 tsp. orange zest
1/2 tsp. vanilla
1 egg
1/4 cup coarsely chopped walnuts

Heat oven to 350 degrees F.
Line or grease a muffin tin. You can use a large 6 muffin tin or standard 12 muffin tin.
Mix dry ingredients together.
In a mixer, cream butter or oil and sugar. Add bananas, egg, applesauce, vanilla and orange zest. Mix well. Add nuts. Fold dry ingredients into wet.
Scoop out into prepared muffin tins. Fill only 3/4 full. These will rise a little bit.
Bake 25 minutes, or until a toothpick comes out clean.