Preheat Oven:
Preheat your oven to 400°F (200°C).
Prepare the Seasoning / Liquid Mixture:
In a small bowl or measuring cup, mix together the vegetable stock, fresh lemon juice, chopped fresh thyme, ground cinnamon, kosher salt, and black pepper.
Assemble in Baking Pans:
Spread the chopped smoked sausage, sweet potatoes, apples, onions, and bell peppers across your baking pans (use two pans if needed so everything fits in an even layer).
Pour the seasoning/liquid mixture evenly over the ingredients and toss well to coat.
Bake:
Roast in the oven at 400°F for about 60 minutes (to 1 hour 10 minutes), or until the sweet potatoes and apples are completely tender.
Stir/mix the pans every 15 minutes (about 3 times throughout cooking) to ensure everything browns and cooks evenly.
Serve:
Remove from the oven, let cool slightly, and serve warm!