Mix glutinous flour, fresh milk, and salt in a bowl.

Microwave the mixture for 5-7 minutes until cooked.

Add butter while hot and mix well.

For the filling, melt Kit Kat matcha and mix with matcha powder and milk to form a paste. Adjust the amount of paste to your preference.

Roll out mochi dough with a baking roller to flatten.

Place your desired amount of filling in the center and gently wrap with mochi skin, avoiding wrapping too tightly.

Place each mochi in a small container, cover properly, and refrigerate.