Soften cream cheese and let eggs come to room temp (15–30 minutes).
Whisk 6 eggs in a bowl until smooth. Add 120 g softened cream cheese and whisk until lump-free. Stir in 1 tbsp melted butter, vanilla, 1 tsp cinnamon, & a pinch of salt. Add 2 tbsp powdered erythritol if you like sweeter crepes. Thin with 1 tbsp water or cream if batter seems too thick.
Heat a nonstick skillet over medium and lightly brush with butter. Pour ~1/4 cup (60–70 ml) batter into pan; tilt to spread thin. Cook 45–60 seconds until edges lift and the surface is set, flip and cook 10–20 seconds. Remove and repeat for remaining batter.
Make filling: beat 120 g cream cheese with 2 tbsp butter, 3 tbsp powdered erythritol, and 1 tsp cinnamon until smooth. Add 1 tbsp heavy cream if needed to reach spreadable consistency.
Spread 1–2 tbsp filling on each crepe, sprinkle with cinnamon-erythritol if desired, fold or roll, and serve warm or chilled.