For those of you who prefer to use oil over butter, be my guest (use 1 cup vegetable oil instead of the butter) but I have to tell you, I've made these both ways, and the butter version just tastes better.

You don't need a mixer for this recipe.

Note, if you are including walnuts and dried fruit, you will likely have more batter than is needed for 12 muffins. I got about 14 muffins from this batch, and that included filling the muffin cups up as far as they could possibly go (above the surface of the muffin tin).