In a large skillet or paella pan, cover with 2 tablespoons olive oil and place over medium heat. Cook the shrimp 2 minutes on each side, remove and set aside.
Add the remaining olive oil, onion, red bell pepper and salt. Cook just until soft.
Add in the chicken thighs and cook completely before adding the chorizo and riced cauliflower.
When the cauliflower rice is no longer frozen, add the diced tomatoes, chicken bouillon, garlic and stir.
In a small bowl, whisk the water and corn starch together. Add the cornstarch mixture, saffron threads, and peas to the cauliflower rice and stir.
Place the shrimp and mussels on top. Cover and cook for 10 minutes on medium/low heat or until the mussels have opened.