Stir 3 cups of packaged stuffing with melted butter in a large bowl.
Reserve 1/2 cup of stuffing mix and place the remaining stuffing mixture into bottom of baking dish. I use 9x13.
Using same large bowl, mix together soup, sour cream, cheddar cheese, squash, zucchini, and carrots. Salt & pepper to taste.
Spread mixture onto the cornbread layer and smooth evenly.
Sprinkle remaining 1/2 cup of cornbread mixture over the vegetable mixture.
Bake at 350 degrees for 40-45 minutes until casserole is bubbly.
Serve and Enjoy.