Heat oven to 350°F and grease a 9 x 13-inch baking dish. Set aside.
In a small bowl mix together the 1 teaspoon kosher salt, 1/2 teaspoon chili powder, and 1/2 teaspoon black pepper. Season chicken thighs on both sides with seasoning mixture.
Heat the 2 tablespoons olive oil in a large frying pan over medium-high heat. Add the chicken thighs and brown on both sides, about 3-4 minutes per side. Chicken will not be cooked through. It will finish cooking in the oven. Remove to a plate.
Add the onion, green and red bell peppers and the 1 cup rice. Season with salt and pepper and cook, stirring frequently to prevent the rice from sticking to the bottom until the onions become soft, about 3 minutes.
Add the garlic and 1 tablespoon tomato paste and cook, stirring another minute. Then add the roma tomatoes and 1 teaspoon cumin and cook a few minutes more until the tomatoes start to break down.
Transfer mixture to the baking dish. Stir in the 1 3/4 cups chicken broth and place the chicken thighs on top. Cover with foil.
Bake for 30 minutes. Remove the foil and sprinkle the 3/4 cup peas all around. Push them down into the rice mixture. Cover with foil again and return to the oven another 10 minutes.
Remove and let rest, covered at least 10 minutes before serving. Sprinkle the cilantro over the top and squeeze the lemon over everything and enjoy!