Stir together flour, baking soda, salt, and sugar in mixing bowl. Beat egg yolks in separate bowl until lemon-yellow in color. Slowly add sour cream and cottage cheese. Add liquid mixture to dry ingredients, stirring just until blended. Fold in egg whites.
Griddle is ready when a few drops of water bubble and skitter rapidly around.
Cook pancakes until puffed, bubbly and dry around edges. Turn and cook other sides until golden brown. All rights reserved.