The best cornbread mix in the world is good old Jiffy Corn Muffin Mix. Try it with pumpkin.
1 package Jiffy Corn Muffin Mix
2/3 cup canned, pureed pumpkin
1 heaping teaspoon brown sugar
¼ teaspoon cinnamon
Preheat oven to 400 degrees. Prepare batter according to package instructions. Add pumpkin, brown sugar and cinnamon. Mix gently into batter and let rest 4 minutes. Scrape batter into buttered 8 x 8 baking dish and bake 20 minutes or until done