Combine the paprika, black pepper and garlic powder in a small bowl. Rub the spice mix all over the boneless chicken thighs and marinate chicken for 1 hour, up to 12 hours, in the refrigerator.
Preheat oven to 400F. On a lined, rimmed 1/2 sheet pan, arrange cauliflower pearls evenly over surface of pan. Add roasted bell pepper, white onion, garlic and peas and lightly toss together. Arrange chicken thighs evenly over cauliflower rice mixture and drizzle EVOO over the top. Place in oven and cook for 10 minutes.
Remove pan from oven and add chicken broth and dry white wine over the mixture evenly. Add canned chopped tomatoes over the top along with chopped olives. Sprinkle saffron threads evenly over the top. Season with salt and pepper. Season with salt and pepper. Place back in over for 10 minutes.
Position mussels and shrimp on pan. Return back to oven and cook another 5-8 minutes, or until mussels have opened completely and shrimp has turned pink. Finish with melted ghee over mussels and shrimp. Top with chopped parsley.