In a large mixing bowl, sift together the flour, baking powder, salt, and sugar to ensure a lump-free batter.
In a separate bowl, whisk the eggs, then add the milk, sparkling water, and vanilla extract. Mix until well combined.
Melt the butter, let it cool slightly, and then whisk it into the egg mixture.
Gradually pour the wet ingredients into the dry ingredients, whisking constantly until you have a smooth, lump-free batter.
Lightly grease a skillet with oil and heat over medium heat.
Pour a small ladleful of batter onto the hot skillet, spreading it into a circular shape. Cook for 1-2 minutes, until the edges set and bubbles start to form on the surface.
Carefully flip the pancake with a spatula and cook for another minute, until golden brown.
Repeat the process until all the batter is used. If needed, re-grease the skillet with a little oil between batches.
To make the vanilla cream, heat the milk in a small saucepan with the vanilla bean (split in half lengthwise). Remove from the heat and let it steep for a few minutes.
In a separate bowl, whisk together the egg yolks, sugar, and cornstarch. Slowly pour in the warm vanilla milk, whisking constantly.
Return the mixture to the saucepan and cook over low heat, stirring constantly, until the cream thickens.
Let the vanilla cream cool slightly, then fill the pancakes and roll them up.
Serve the vanilla cream pancakes sprinkled with powdered sugar or garnished with fresh fruit.
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