Whole wheat muffins (with blueberries)

Preheat over 400 degrees.
Melt and set aside:

1/4 cup butter

Sift together:

1 cup white flour
1 cup whole wheat flour
2 Tbsp sugar
2 1/2 tsp baking powder
1/2 tsp salt

mix separately:

1 egg
1 cup milk
melted butter
blueberries (optional)

Combine until flour is moistened, not smooth.
Spoon into muffin tins 2/3 full.
Bake 25 minutes.

From New York Times Cookbook