Heat the olive oil in a small paella pan or wide heavy-bottomed skillet over medium heat.
Add the diced chicken breast and sliced chorizo, sautéing until the chicken is browned and the chorizo has released its oils.
Stir in the diced onion and red bell pepper, cooking for 3-4 minutes until the vegetables are softened.
Add the minced garlic, smoked paprika, and Bomba rice, stirring constantly for 1 minute to toast the rice grains.
Stir the saffron threads into the chicken broth, then pour the broth and tomato puree into the pan.
Season with sea salt and black pepper, then bring to a boil; reduce heat to low and simmer undisturbed for 10 minutes.
Arrange the shrimp and scrubbed mussels on top of the rice, pressing them down slightly.
Cover the pan and cook for another 5-8 minutes until the shrimp are pink and the mussels have opened.
Scatter the frozen peas over the top during the last 2 minutes of cooking.
Remove from heat, cover with a clean kitchen towel, and let rest for 5 minutes before serving with a fresh lemon wedge.