Heat olive oil in a large skillet or paella pan over medium heat. Add onion, garlic, and bell peppers. Cook until softened, about 5 minutes.
Stir in diced tomato and cook for another 2 minutes.
Add rice to the pan and stir to coat with the vegetable mixture.
In a separate pot, heat the broth with saffron threads until warmed through. Stir in smoked paprika, salt, and pepper.
Pour the broth mixture over the rice in the pan. Bring to a simmer and cook, without stirring, for about 15-20 minutes, or until the rice is almost tender and most of the liquid has been absorbed.
Arrange cooked chicken, seafood, and green peas on top of the rice. Cover and cook for an additional 5-10 minutes, or until the rice is fully cooked and the seafood is heated through.
Remove from heat and let rest for a few minutes before serving. Serve with lemon wedges on the side for squeezing over the paella. Enjoy!