Heat the olive oil in a wide skillet or paella pan over medium heat.
Add the diced chicken breast and sear until golden on all sides, then remove and set aside.
In the same pan, sauté the diced onion and bell pepper until softened, then stir in the minced garlic and cook for 1 minute.
Add the tomato puree, smoked paprika, and sea salt, stirring constantly for 2 minutes to create a thick base.
Stir in the dry Bomba rice, ensuring every grain is coated in the tomato and oil mixture.
Pour in the chicken bone broth and add the saffron threads, stirring once to distribute.
Bring to a boil, then reduce heat to a low simmer; arrange the shrimp, mussels, and seared chicken on top of the rice.
Cover and cook for 15-18 minutes without stirring to allow the rice to absorb the liquid and form a crust on the bottom.
Scatter the frozen peas over the top during the last 2 minutes of cooking.
Remove from heat and let the paella rest for 5 minutes before serving with a fresh lemon wedge.