Preheat oven to 425Place sausage in a skillet over medium heat and cook until evenly brown.Drain grease.In a bowl mix sausage, cream cheese, cheddar cheese and green onion.Spoon about 1 tablespoon of mixture into each jalapeño half.Arrange halves in a baking dish.Bake for 20 minutes until bubbly and lightly browned.