Mix the Dry Ingredients: In a large bowl, combine the all-purpose flour, sugar, salt, and baking powder. Mix well.

Add the Wet Ingredients: Make a well in the center of the dry ingredients and crack the eggs into it. Whisk gently to combine.

Gradually pour in the warm milk while whisking continuously to form a smooth, thick batter. Reserve a small portion of the milk for later.

Incorporate Remaining Ingredients: Add the melted butter, vanillin or vanilla extract, and lemon juice to the batter. Mix until well incorporated.

Pour in the remaining milk and whisk until the batter is smooth and slightly runny.

Cook the Crepes: Heat a non-stick or ceramic-coated pan over high heat.

Add a thin layer of batter to the pan, tilting it to spread the batter evenly.

Cook until the edges begin to lift and the bottom is golden brown, then flip and cook the other side until golden.

Repeat with the remaining batter, making sure to stir the batter occasionally to keep it smooth.

Serve: Serve your warm crepes with your favorite toppings, such as fresh fruits, whipped cream, chocolate sauce, honey, or a sprinkle of powdered sugar.