Mix all the sausage ingredients together in a large bowl. Cover and set aside in the fridge for at least an hour, or preferably overnight.
Heat a large skillet with a splash of olive oil to medium heat. Add in the sausage and cook for about 5-7 minutes until browned and cooked through. Remove from the pan, keeping the accumulated fat in the pan.
Add in the sweet potatoes and cook for about 10 minutes to lightly starting to brown. Add in the peppers and onions when the potatoes feel almost done but a fork still meets some resistance when going through the potato.
Turn heat to high and brown the peppers and onions and finish cooking the potatoes. Season with salt and pepper.
Add in the sausage to warm when the veggies are done. Cool and stir for 2 minutes. Remove from heat and serve.