Batter: Combine eggs and milk. Add sour cream and blend well. Add flour gradually. Mix well until batter is smooth. Heat on a low flame a small amount of oil in an 8-inch frying pan until hot but not smoking. Ladle a small amount of batter (approx. 1 ounce) into pan, tipping pan in all directions until batter covers the entire bottom of the pan. Fry on one side until set and golden, approx. 1 minute. Slip pancake out of pan and repeat until all batter is used. Add oil to pan as necessary.
Filling: In another bowl mix all ingredients for filling.
Assemble: Fill each pancake on golden side with 3 Tbsps. of filling. Fold in sides to center and roll blintz until completely closed. Replace rolled blintzes in pan and fry for 2 minutes, turning once.