Preheat oven to 400 degrees F. Place the sweet potatoes on a sheet pan and place in the oven. Bake for 30 minutes. Remove from oven and prick with a fork. Bake for 30 more minutes.
Bring the orange juice and stock to a boil in a saucepan. Add the quinoa and reduce to a simmer. Cover and cook for 15 minutes, until quinoa is fluffy and liquid is absorbed.
Heat a skillet over medium heat. Add the olive oil, green onions, and celery and cook until soft. Stir in the cranberries and pecans and season with salt and pepper. Stir in the orange zest.
When the quinoa is down cooking, add it to the pan and stir until well combined.
When the sweet potatoes are done baking, cut a slit into the top. Stuff with the quinoa mixture and serve.