Whisk together flour, sugar, baking powder and soda. (Add a pinch of salt if desired.) Set aside.
In large bowl, whisk together yogurt, egg, butter and milk. Add to flour mixture; stir just until combined. Fold in raspberries.
Heat a griddle over moderately high heat; brush with additional melted butter. Drop scant 1/4 cupfuls of batter onto griddle; cook for 1 minute or until bubbles form on top. Turn and cook 1 minute more. Serve with raspberry jam and sugar.