Peel the potatoes then chop into cubes with a sharp knife.
Add the potatoes to a large sheet pan or roasting dish and drizzle with a few tablespoons of olive oil. Season generously with salt and pepper then toss to coat.
Place in a preheated oven and allow to roast for 30 minutes, tossing halfway, or until the potatoes are golden and crisp.
Place the chicken breasts in between two sheets of parchment paper then gently flatten out with a meat mallet or rolling pin. You want the chicken to be approximately 1-2cm thick.
Drizzle with olive oil then season on both sides with salt, pepper and oregano.
Heat a large, deep pan over medium-high heat. A
dd the chicken and sear for 2-3 minutes per side until golden brown. Remove from the pan and set aside.
In the same pan, add a splash of oil then cook the onion and garlic for a few minutes until fragrant, scraping off the brown bits on the bottom of the pan.
Add the chicken stock and allow to simmer for 2-3 minutes then add the cream and Dijon.
Allow to simmer for 5 minutes or until the sauce easily coats the back of a spoon.
Add the lemon juice and season with salt and pepper.
Place the chicken back in the sauce and allow to cook for another 5 minutes then scatter over fresh parsley and serve with the crispy potatoes.