Preheat Oven:
Heat oven to 375°F (190°C). Cover a baking sheet with foil or parchment.Cook Sausage:
Cook sausage in a large skillet over medium heat, breaking it into small pieces. Drain excess fat.Prepare Gravy:
Make the gravy following the package instructions.Arrange Bagels:
Arrange bagel halves on the prepared sheet. Spread gravy over each half. Season with salt and pepper.Add Mozzarella:
Distribute shredded mozzarella over the gravy.Top with Sausage:
Add crumbled sausage on top of cheese, then sprinkle with a bit more cheese.Bake Until Melted:
Bake for 5-7 minutes until cheese is melted.Serve Warm:
Serve while warm.