In a mixing bowl, whisk together the flour, cornstarch, baking powder, and salt. Set aside.
In another bowl, combine the milk, egg yolks, 1 tablespoon of sugar, and vanilla extract. Mix until well combined.
Gradually add the dry ingredients to the wet mixture, stirring until just combined. Avoid over-mixing.
In a clean bowl, beat the egg whites using an electric mixer until soft peaks form. Gradually add the remaining tablespoon of sugar and continue to beat until stiff peaks form.
Gently fold the whipped egg whites into the batter in batches, being careful not to deflate the mixture. The batter should be light and fluffy.
Preheat a non-stick skillet over low heat and lightly grease with butter. Using a ring mold (or simply a round cookie cutter), pour about 1/4 cup of batter into the mold and cover the pan with a lid.
Cook the pancake for about 4-6 minutes on low heat, then carefully flip it over (remove the mold and gently flip) and cook for another 4-6 minutes until golden brown and fluffy. Repeat with the remaining batter.
Stack the pancakes high on a plate, drizzle with maple syrup, and decorate with fresh fruit on the side.
Notes
Serve the pancakes stacked in a tower, lightly dusted with powdered sugar, and topped with a dollop of whipped cream if desired. Add a sprig of mint for a pop of color.