Boil cabbage leaves and chives in a pot with water over medium-high heat until tender.
In a small pot, bring salted water to a boil and add the chopped carrots, bell peppers, and kalabasa. Boil until fork tender and drain. Transfer the vegetables to a blender and add milk and both kinds of cheese. Blend until smooth. Return cheese sauce to the pot and bring to a simmer. Mix thoroughly until smooth and thick.
In a bowl, mix together all remaining ingredients until well combined and evenly distributed. Season with salt and pepper.
Place about a tablespoon of filling onto a cabbage leaf and wrap up.
Tie the cabbage roll using a chive leaf to lock the roll in place.
Steam for about 15 - 20 minutes.