Heat olive oil in a large high-sided skillet over medium-high heat. Pat chicken dry and season on both sides with salt and pepper. Once oil is hot, brown the chicken for 4 minutes on each side. Remove the chicken from the pan to a plate.
Add onion and garlic to the pan and sauté until tender, about 3-4 minutes. Season with salt and pepper. Sprinkle in smoked paprika and stir to toast. Add rice and sauté for 1 minute, then stir in the wine and scrape up any browned bits on the bottom of the pan. Add tomatoes and chicken stock and bring to a simmer.
Nestle chicken into the rice and pour in any drippings left over on the plate. Cover with lid and place in the oven for 40 minutes. Remove lid, sprinkle in peas, and continue baking for 5 more minutes, until all the liquid is absorbed.
Season shrimp, if desired, with salt and ground black pepper. Melt I Can’t Believe It’s Not Butter!® made with Olive Oil Spread in 12-inch nonstick skillet over medium-high heat and cook shrimp, turning once, 3 minutes or until shrimp turn pink. Remove shrimp to serving platter and keep warm.
Cook onion in same skillet, stirring occasionally, 4 minutes or until golden. Stir in garlic and red pepper flakes and cook 30 seconds. Stir in remaining ingredients and bring to a boil over high heat. Reduce heat to low and simmer 3 minutes. Return shrimp to skillet and heat through. Serve, if desired, with hot cooked rice.