STUFFED EBELSKIVERS

Steps:

• Whisk together the flour, light brown sugar, baking powder, baking soda and salt in a medium bowl.
• Whisk together the egg yolks, milk and sour cream in another medium bowl. Whisk the yolk mixture into the flour mixture until just combined. The batter will be lumpy. Allow the batter to rest while you whip the egg whites.
• Put the egg whites in another medium bowl. Using an electric mixer, beat the whites until stiff peaks form, about 1 minute. Gently fold the egg whites into the batter.
• Heat an ebelskiver pan on medium heat for 4 minutes. Reduce the heat to medium-low heat. Put a cube of butter into 4 of the wells; it should barely sizzle when it hits the pan. Use the back of a spoon to slide the butter up the sides of the wells so that each well is coated and some butter pools at the bottom. Fill the buttered wells almost to the top with batter, about 2 tablespoons each. Repeat with the butter and batter in the remaining 4 wells. (You are working in batches to prevent the butter from burning.)
• Cook until the batter puffs and bubbles on top, 3 to 4 minutes. Then take a wooden skewer, push it through the raw batter and into the bottom crust of each ebelskiver to turn it and confirm the bottom is set into a golden brown crust (if it's not, return the dumpling to its original position and let it continue to cook). Using the skewer, turn the ebelskivers so the cooked parts are half-in, half-out of the cups. Raw batter will spill into the wells but the dumplings should hold their shape. (If a dumpling does not slide up easily or hold its shape, slide it back to its original position and give it more time to cook and set.)
• Cook until the new undersides are golden brown, 2 to 3 minutes more. Carefully stuff the desired filling into the openings. (For each ebelskiver use 1 large or 2 small raspberries, 3 or 4 semi-sweet chocolate chips or a heaping 1/2 teaspoon of fruit preserves or jam.) Use up to 1 teaspoon of additional batter to top the filling in each ebelskiver. Using the skewer and a finger, if necessary, turn the ebelskivers once more so the additional batter is now on the bottom of the wells. Cook until golden brown, 2 to 3 minutes more.
• Check all sides of the ebelskivers: If there are pale spots on some, turn them down so they brown against the bottom of the pan for a few seconds. When they are done, the ebelskivers should be evenly deep golden brown and a skewer inserted deep into the dough, avoiding the filling, comes out clean. If you find that some are cooking much more quickly than others, rotate the pan occasionally to even out the heat.
• Remove the ebelskivers from the pan. Repeat the buttering and turning process with the remaining batter to make 6 or 7 more ebelskivers. By the second batch, the pan will be significantly hotter, so you won't need to increase the heat to medium to get started and the ebelskivers will cook more quickly.
• Dust the ebelskivers with confectioners' sugar and serve warm with maple syrup.
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