Given the task definition and input, reply with output. In this task, you have to identify the named entities (NER) which are the ingredients required given its directions. Named entities are the names of the items without their quantity.

Heat oven to 400., Spray pie plate with non-stick cooking spray., Cook and stir sausage and onion in skillet, until sausage is brown., Drain., Spread in a pie plate., In a mixing bowl, beat milk, Bisquick, eggs, salt and pepper on high for 1 minute., Pour into pie plate over top of sausage., Bake 25 minutes., Top with grated cheese., Bake until a knife inserted in the center comes out clean and cheese is melted (about 5 minutes).
ground sausage, onion, milk, Bisquick baking mix, eggs, salt, pepper, Cheddar cheese