Penne Pasta with Sausage and Cheesy Garlic Bread

Name: Penne Pasta with Sausage and Cheesy Garlic Bread
Ingredients: 1 pound penne pasta; 2 tablespoons olive oil; 1/2 medium yellow onion, diced; 1 tablespoon garlic, chopped; 1 tablespoon Italian seasoning mix; 1/4 teaspoon crushed red pepper flake, optional; 4 Italian-style hot pork sausages, cut into 1/2-inch slices; 1 (28-ounce) can diced tomatoes, drained; Kosher salt and freshly ground black pepper; 1/4 cup heavy cream; Basil leaves, for garnish; 1/2 store-bought garlic bread (save other half for Pizza); 1 cup shredded mozzarella cheese; 1/2 teaspoon Italian seasoning mix