Pat chicken dry with a paper towel, then season well with salt and black pepper.
Heat oil in a large skillet over medium-high heat. Place chicken into hot skillet, and sear for 2-3 minutes per side, or until golden brown. (You do not want to fully cook the chicken in this step, just sear it until brown).
Remove chicken from skillet, then add onion and garlic to the skillet. Cook 4-5 minutes or until onion is soft.
Add in the rice and cook for 1-2 minutes to toast the rice, then pour in the chicken or vegetable broth. Gently stir and lift any brown bits from the bottom of the skillet.
Return chicken to the skillet, then bring rice to a boil before reducing to a simmer. Cover skillet with lid, and leave to simmer for 20 minutes, or until rice is cooked. Remove from heat, add in lemon juice and gently fluff rice with a fork. Serve warm with fresh chopped parsley on top.