Preheat your oven to 400°F and line a large sheet pan with parchment paper.
Slice the chicken sausage into half-inch rounds and thinly slice the bell peppers and red onion.
Place the sausage, peppers, and onions on the sheet pan and drizzle with olive oil.
Sprinkle the cumin, coriander, turmeric, smoked paprika, cayenne, sea salt, and black pepper over the ingredients.
Toss everything thoroughly to ensure the sausage and vegetables are evenly coated in the spice blend.
Spread the mixture into a single layer and roast for 20 minutes until the vegetables are tender and the sausage is lightly browned.
While the pan is in the oven, gently reheat your cooked brown rice in a small pot or microwave.
Remove the sheet pan from the oven and immediately drizzle the fresh lemon juice over the hot sausage and vegetables.
Divide the warm brown rice into two bowls and top with the roasted shawarma mixture.
Garnish each bowl with freshly chopped parsley and serve immediately.