Pre-heat oven to 350°F.
Wash and slice the peppers in half lengthwise and remove ribs and seeds.
Place them on a parchment lined baking sheet.
In a medium bowl, mix the sausage, cream cheese, cheddar and Parmesan together until well combined.
Taste filling and add salt and or pepper, if needed.
Fill the peppers with the sausage mixture.
Bake for 12 - 14 minutes.
Serve warm.