1. Preheat oven to 350°F. Cook sausage in large skillet over medium-high heat 8-10 minutes or until thoroughly cooked, stirring frequently; drain.
2. Line 9-inch pie plate with crust according to package directions for one-crust pie.
3. Beat eggs, salt and pepper in large bowl with wire whisk until well blended. Stir in ricotta cheese, mozzorella cheese, sausage, spinach and onions; spoon into crust.
4. Bake 40-45 minutes or until edge of filling is golden brown and knife inserted near center comes out clean. Let stand 5 minutes before serving.
Cook's Tip: Cover edge of crust with strips of foil for the lage 15 minutes of baking time if crust beomces too brown.
8 servings (1 slice each)