1 3/4 cups all-purpose flour
3/4 tsp. baking soda
1 tsp. baking powder
1 1/2 Tbs. granulated sugar
1/2 tsp. salt
3 eggs, separated
1 3/4 cups buttermilk
4 Tbs. (1/2 stick) unsalted butter, melted
1 cup Raspberry filling
Confectioners' sugar for dusting
Maple syrup for serving
In a bowl, whisk together the flour, baking soda, baking powder, granulated sugar and salt.
In a small bowl, lightly whisk together the egg yolks and buttermilk. Whisk the yolk mixture into the flour mixture until well combined; the batter will be lumpy.
In another bowl, using an electric mixer fitted with the whisk attachment, beat the egg whites on high speed until stiff but not dry peaks form, 2 to 3 minutes. Using a rubber spatula, gently fold the whites into the batter in two additions.
Put 1/2 tsp. butter in each well of a filled-pancake pan. Place over medium heat and heat until the butter begins to bubble. Pour 1 Tbs. batter into each well and cook until the bottoms are golden brown and crispy, 3 to 5 minutes. Put 1/2 to 1 tsp raspberry filling in the center of each pancake and top with 1 Tbs. batter. Using 2 wooden skewers, flip the pancakes over and cook until golden and crispy, about 3 minutes more. Transfer to a plate. Repeat with the remaining batter and blueberries.
Dust the pancakes with confectioners' sugar and serve warm with maple syrup. Makes about 40.