In a bowl, mix the sausage, cream cheese, cheddar cheese, and green onion. Spoon about 1 tablespoon sausage mixture into each jalapeno half. Arrange stuffed halves in a baking dish. Bake 20 minutes in the preheated oven, until bubbly and lightly browned.
Tips on seeding the jalapenos. 1) Wear gloves throughout the entire process, then remove right after so you don’t transfer to sink faucet, cabinet handles, etc. 2) I love my little lemon zester tool for seeding but a small melon baller works great too. 3) As you half and seed the jalapenos and put into a bowl of continuous running water. This helps soften to bake better and removes some heat.