Season the chicken breasts with salt, pepper, oregano, and paprika on both sides.
In a large skillet, heat 2 tablespoons of olive oil over medium-high heat. Once hot, add the chicken breasts and sear for about 5-6 minutes on each side, or until golden brown and cooked through. Remove from the skillet and let rest for at least 5 minutes before slicing into bite-sized pieces.
In the same skillet, add the diced onion and cook for about 3-4 minutes until softened. Add the minced garlic and cook for an additional 1 minute until fragrant.
Stir in the orzo, allowing it to toast slightly for about 1-2 minutes. Then, add the cherry tomatoes, chicken broth, lemon zest, and lemon juice. Bring to a boil.
Reduce the heat to medium-low, cover, and let it simmer for about 10-12 minutes, or until the orzo is tender and has absorbed most of the liquid. Stir occasionally to prevent sticking.
Once the orzo is cooked, return the sliced chicken to the skillet. Toss everything well to combine and heat through for another 2-3 minutes. Adjust seasoning with additional salt, pepper, or lemon juice to taste, if desired.
Remove from heat, garnish with freshly chopped parsley, and serve hot. Optionally, sprinkle with grated Parmesan cheese for extra flavor.