Cook pasta according to package directions. Drain and return to pan.
Meanwhile, in large nonstick skillet, heat oil over medium-high heat. Add shallots and garlic; cook and stir 1 minute. Add sausage; cook, breaking into crumbles, about 5 minutes until sausage is browned and cooked through, stirring frequently.
Add tomatoes and red pepper flakes to skillet; cook 5 minutes to heat through, stirring occasionally.
Meanwhile, combine all Herbed Ricotta Ingredientsin a large bowl; mix well.
Combine pasta and Herbed Ricotta. Add sausage mixture. Season with salt and pepper, as desired. Spoon into 3-quart casserole dish sprayed with nonstick cooking spray. Top with mozzarella. Bake at 375*F for 30 minutes or until heated through.