Preheat oven to 350 degrees.
Salt chicken breast and cook chicken in 2 tbsp olive oil until just browned on both sides. About 3 minutes each side.
Lay the chicken on the sheet pan. Lay potatoes and onion around chicken pieces
In a small bowl mix lemon juice, olive oil, oregano, and minced garlic.
Pour over chicken and potatoes making sure potatoes are all covered. I use a basting brush to make sure chicken is well covered.
Roast the chicken and potatoes until both are golden and crispy and the chicken is cooked through, about 50 minutes - 1 hour depending on your oven.