In a mixing bowl - add GMS, CMC and corn flour.
Then add milk powder, mix well with a spoon. Add 1/4 cup milk. Mix well to form a smooth paste without lumps.
Boil milk and simmer for 3mins.
Now add sugar and mix well, then add the corn flour mix.
Keep cooking in low flame until it is slightly thick (no it will coat the ladle just thick that's enough). Switch off.
Cool down completely then add butterscotch essence and yellow food color. Mix well.
Now transfer the mixture to a freezer safe box. Close with tight lid. Freeze it for 2 hrs.
After 2 hrs, transfer to mixer jar and blend it until smooth.
Now again freeze for 2-3 hours, blend again. This is done to prevent crystallization.
Repeat this process once again.
Finally add butterscotch chips, transfer to freezer safe box, sprinkle little butterscotch chips on top, close with lid and freeze for at least 8 hours. Then scoop and serve Butterscotch Ice Cream.