Beat egg whites and cream of tartar at high speed with an electric mixer until stiff peaks form.
Beat egg yolks, ricotta cheese, and next 5 ingredients at medium speed with electric mixer until smooth. Fold in egg whites.
Pour about 1/4 cup batter for each pancake onto a hot, lightly greased griddle. Cook until tops are covered with bubbles and edges looked cooked; turn and cook other side. Serve with Strawberry Butter; garnish, if desired.
*3/4 cup egg substitute may be substituted for 3 eggs. Whisk together egg substitute, cream of tartar, and next 6 ingredients. Cook as directed