Cook manicotti noodles according to the directions on the box.
Rinse noodles and lay on a towel to cool.
Prepare the stuffing according the directions on the box.
While the noodles are cooling, mix the sour cream, cream of chicken soup and 1 c. grated cheese. Reserve 1 cup of the mixture and set to the side.
To the remaining mixture add Stove Top and chicken. Mix together.
Use a small spoon to fill the manicotti tubes with the filling. Place in a 9x13" pan. Continue until all the tubes are full or you run out of filling, whichever comes first.
Spread the sour cream/cheese mixture over the top of the noodles and sprinkle with cheese. Cover with foil and back at 350 for 30 minutes.