In a large mixing bowl, beat the cream cheese, 3 ½ cups of shredded cheddar, and ranch seasoning until well combined.
Lay out a sheet of plastic wrap. Scoop the cheese mixture into the center and shape it into a round ball as you wrap it up.
Cut 4 pieces of bakers twine and lay them out in a crisscross pattern. Place the wrapped cheese ball in the center, then tie the twine around it to create a pumpkin shape.
Chill for at least 4 hours.
Before serving, bring the last ½ cup of shredded cheese to room temperature.
Unwrap the cheeseball, roll it in the remaining cheese.
gently press a bell pepper stem into the top. If the pumpkin shape needs a little help, press a spoon handle into the grooves.