Brie and Sausage Brunch Bake

1 pound bulk Italian sausage
1 small onion, chopped
8 cups cubed day-old sourdough bread
1/2 cup chopped roasted sweet red peppers
1/2 pound Brie cheese, rind removed, cubed
2/3 cup grated Parmesan cheese
2 tablespoons minced fresh basil or 2 teaspoons dried basil
8 large eggs
2 cups heavy whipping cream
1 tablespoon Dijon mustard
1 teaspoon pepper
1/2 teaspoon salt
3/4 cup shredded part-skim mozzarella cheese
3 green onions, sliced

In a large skillet, cook sausage and onion over medium heat until meat is no longer pink; drain. Place bread cubes in a greased 13x9-in. baking dish. Layer with sausage mixture, red peppers, Brie and Parmesan cheeses and basil. In a large bowl, whisk eggs, cream, mustard, pepper and salt; pour over top. Cover and refrigerate overnight.

Remove from the refrigerator 30 minutes before baking. Preheat oven to 350°. Bake, uncovered, 45-50 minutes or until a knife inserted near the center comes out clean. Sprinkle with mozzarella cheese. Bake 4-6 minutes or until cheese is melted. Let stand 10 minutes before cutting. Sprinkle with green onions. Makes 12 servings.