Heat olive oil in large pot over med-high heat. Add shallots and garlic, sauteeing for 30 seconds. Add chicken and cook for 2-3 min until lightly browned. Add crushed tomatoes, vodka and chicken broth. Bring to a boil and simmer, covered, for 10 minutes. Meanwhile, preheat oven to 375 F.
Add whipping cream, parmesan cheese, salt, pepper and red chili flakes, stirring well to combine. Cook for another 2 min then remove from heat. Add dried pasta, tossing well to coat.
Grease a large oven safe dish (I used a 9x13 baking dish) and then add pasta mixture, pushing pasta down into liquid as much as possible.
Cook in the oven, covered in tin foil, for 40 minutes, stirring halfway through cooking time. Remove from oven, stir in red pepper and spinach then top with mozzarella cheese, then cook for another 10 minutes or until cheese is melted.
Garnish with fresh basil, then serve and enjoy!