In a large bowl, beat the eggs, milk, soda, butter, coffee and vanilla. Combine the flour, sugar, cocoa and salt; add to milk mixture and mix well. Cover and refrigerate for 1 hour.
Heat a lightly greased 8-in. nonstick skillet over medium heat; pour 2 tablespoons batter into the center of skillet. Lift and tilt pan to coat bottom evenly. Cook until top appears dry; turn and cook 15-20 seconds longer. Remove to a wire rack. Repeat with remaining batter, greasing skillet as needed. When cool, stack crepes with waxed paper or paper towels in between.
For filling, in a large bowl, beat the cheeses and sugar until fluffy. Add liqueur and vanilla; beat until smooth. Spoon about 2 tablespoons filling down the center of each crepe; roll up. Top with chocolate syrup, whipped cream and cocoa if desired. Yield: 22 crepes.