Preheat the oven to 450°F. Place a 9- or 10-inch ovenproof skillet or pie pan on the center rack as the oven heats so the pan gets very hot.
In a blender, combine the eggs, flour, milk, almond extract, vanilla extract, and lemon zest. Blend until smooth and frothy, 20-30 seconds, scraping down the sides if needed.Or, in a medium bowl, whisk the eggs until foamy, then whisk in the flour, milk, almond extract, vanilla, and lemon zest until the batter is smooth with no streaks of flour. With the blender running on low (or whisking by hand), slowly pour in 2 tablespoons of the melted butter until fully incorporated. Reserve the remaining 2 tablespoons for the pan.
Carefully remove the hot pan from the oven and place it on a heatproof surface. Add the remaining 2 tablespoons melted butter, tilting the pan to coat the bottom and sides.
Immediately pour the batter into the hot, buttered pan and return it to the oven.
Bake until the pancake is puffed, deeply golden at the edges, and the center looks set and lightly browned, 12-18 minutes. It will rise dramatically in the oven and then fall slightly as it cools.
Remove the pan from the oven. Pile the berries into the center of the pancake.
Dust with powdered sugar and drizzle with maple syrup as desired. Slice into wedges and serve right away while the pancake is still puffed and warm.