Preheat oven to 350.

Heat a large nonstick skillet over medium-high heat.

Remove casings from sausage.

Add sausage to pan; cook for 4 minutes or until browned, stirring to crumble.

Stir in apple and onion.

Cover and cook over low heat 5 minutes or until apple is crisp-tender.

Remove from heat; cool slightly.

Combine milk, egg substitute, 1/4 cup cheddar cheese, parsley, 1/4 teaspoon salt, and 1/8 teaspoon black pepper in a large bowl, stirring with a whisk.

Stir in sausage mixture.

Add bread, and stir gently to combine.

Let stand 10 minutes.

Spoon into a 2-quart baking dish coated with cooking spray.

Sprinkle with remaining 1/2 cup cheese.

Bake for 45 minutes or until pudding is set and lightly browned.