- Lightly spray the inside of a 4- to 6-quart slow cooker with nonstick cooking spray.
- Arrange the sliced bell peppers in an even layer across the bottom of the slow cooker.
- Add the sliced sausage over the peppers, spreading it evenly throughout the pot.
- Pour the sweet and sour sauce over the sausage and peppers. Do not add water, as the peppers will release enough moisture during cooking. Gently stir to lightly coat the ingredients.
- Cover and cook on LOW for 4 to 6 hours or on HIGH for 2 to 3 hours, until the peppers are soft and the sausage is heated through.
- Stir everything well before serving, making sure the sausage and peppers are coated in the flavorful sauce. Taste and season with salt and black pepper if desired.
Serve hot on its own, over rice, or with crusty bread for a hearty and satisfying meal.