In a mixing bowl, whisk together the flour, protein powder, sugar, baking powder, and salt.
In another bowl, combine the milk, eggs, vanilla extract, and melted butter.
Gradually add the wet ingredients to the dry ingredients, stirring until smooth. Let the batter rest for about 10 minutes.
While the batter is resting, prepare the cream cheese filling by mixing the softened cream cheese, powdered sugar, vanilla extract, and milk until smooth and creamy. Set aside.
In a small bowl, combine the sugar and cinnamon for the topping.
Heat a non-stick skillet over medium heat and add a little melted butter.
Pour about 1/4 cup of the batter into the skillet, tilting it to spread the batter evenly.
Cook for 1-2 minutes until the edges begin to lift and the bottom is lightly golden. Flip and cook for an additional minute.
Repeat with the remaining batter, adding more butter to the skillet as needed.
To assemble, spread a layer of the cream cheese filling on each crepe, sprinkle with the cinnamon sugar topping, and roll them up. Serve warm.