Whole Wheat Blueberry Pancakes

I found this on baby center. They were quite tasty.

Ingredients

2/3 cup whole wheat flour 
2 tablespoons walnuts, finely chopped 
1 teaspoon baking powder 
1/2 teaspoon salt 
1/2 cup milk 
1 large egg yolk 
2 tablespoons melted butter, plus butter for the skillet 
2 tablespoons maple syrup 
2 egg whites 
Pinch cream of tartar 
1 cup fresh or frozen (and thawed) blueberries 
1 cup fresh or frozen (and thawed) blueberries for topping, optional 

Preparations

In a small bowl, mix together the flour and walnuts. Stir in the baking powder and salt. Whisk together the milk, egg yolk, melted butter, and maple syrup in a large bowl. Add the flour-walnut mixture and gently stir together. In a separate bowl, beat the egg whites and cream of tartar until stiff peaks form. Gently fold the beaten egg whites into the pancake batter. Gently fold in 1 cup of blueberries. Heat a large skillet or pancake griddle over moderate heat and brush lightly with the butter. Let heat 1 minute. Using a large spoon, form pancakes about 3 inches wide, and cook for 2 minutes; gently flip pancakes over, and cook another 1 to 2 minutes. Repeat with the remaining batter. Serve hot with butter and top with the remaining cup of blueberries (if using). (Makes 4 servings)