Gather all ingredients.
Preheat the oven to 425 degrees F (220 degrees C).
Place sausage in a skillet over medium heat. Cook and stir until evenly brown; drain.
Mix sausage, cream cheese, and Parmesan cheese together in a large bowl.
Spoon about 1 tablespoon of sausage mixture into each jalapeño half; arrange stuffed halves in baking dishes.
Bake in the preheated oven until bubbly and lightly browned, about 20 minutes. Serve with ranch dressing.
