Heat oven to 350 degrees F.
Bring a pot of water (enough to cover peppers) to a boil.
Place peppers in the boiling water and boil for 5 minutes. Remove and set aside.
Cook couscous according to directions. Set aside.
Add a small amount of cooking oil to a pan and add turkey sausage. Cook for about 5 minutes or until brown and break into small pieces.
Add onions and garlic and cook for another 5 minutes until onions are soft.
Add diced tomatoes and heat through for another 2 to 3 minutes.
Add reserved couscous and stir into sausage mixture until well combined.
Remove from heat and add goat cheese and Tatsoi. Stir to combine.
Season with salt and pepper.
Fill reserved bell peppers with sausage mixture, packing slightly. Top with additional cheese if desired.
Place in a casserole dish small enough to fit tightly so they don’t fall over and bake for about 20 minutes until heated through. (they can be frozen at this point if you choose)