Chicken sausage stuffed pasta shells

Ingredients

• 1 libra chicken sausage, cooked and crumbled
• 1 package of large pasta shells, cooked per package directions
• 1 tablepsoon olive oil
• 1 cup chopped onion
• 3 garlic cloves, minced
• 12 ounces ricotta cheese
• 1 cup Parmesan cheese
• 1/2 cup mozzarella cheese
• 4 ounces chopped frozen spinach, thawed and patted dry
• 1 egg, lightly beaten
• 1 tablepsoon fresh basil, chopped
• 1/4 cup breadcrumbs
• 2 teaspoons salt and pepper each
• 1 1/2 teaspoon oregano
• 1 1/2 teaspoon ground thyme
• 1/2 teaspoon cayenne pepper
• 1/2 lemon pepper
• 1 28 ounce can of crushed tomatoes