I am not 100% up on my gluten-free restrictions, but would this work? Written by a friend of mine:
Vegetarian Three Sisters Stuffed Squash
Because Vegetarians Can to Be Thankful Too!
By Karen Sharif
A great dish that can be either a main course for vegetarians or a healthful side at Thanksgiving.
Vegetarian Three Sisters Stuffed Squash
Ingredients:
6 acorn squash
1 lb pole beans, removed from shell
2 lb frozen corn, thawed
3 cups prepared brown rice, bulgar, or lentils
1 cup shredded colby jack cheese
1 TBSP dried sage
1 tsp dried oregano
1 tsp dried tarragon
Optional ingredients: sunflower or pumpkin seeds, raisins or currants
Directions:
1.Preheat oven to 350. Halve acorn squash and place face down on an oiled cookie sheet. Cover and bake covered with foil for 40-45 minutes, until just beginning to get tender.
2.Combine remaining ingredients.
3.Place squash halves face up in a baking pan. Spoon mixture into squash, and bake uncovered for an additional 10-15 minutes, until squash is tender and cheese is melted.
Serves 12-18.
ETA: it looks like, on second reading, that you're looking for a meat substitute to go with cornbread and cranberry sauce...and I have no clue about that, sorry!