Preheat the oven to 400 degrees Fahrenheit (200 degrees Celsius).
On a large rimmed baking sheet, toss the diced potatoes with 1 tablespoon of olive oil, 0.5 teaspoon of salt, and 0.25 teaspoon of pepper.
Roast the potatoes for 15 minutes until they begin to soften.
While potatoes roast, season the chicken strips with the remaining salt, pepper, and dried oregano.
Heat the remaining 1 tablespoon of olive oil in a large skillet over medium-high heat. Sear the chicken for 3 minutes per side until golden brown but not fully cooked through.
Remove the baking sheet from the oven. Move the potatoes to one side and arrange the green beans and seared chicken strips on the remaining space.
In a small bowl, whisk together the melted butter and minced garlic. Drizzle the garlic butter evenly over the chicken, potatoes, and green beans.
Return the baking sheet to the oven and roast for 12 to 15 minutes until the chicken reaches an internal temperature of 165 degrees Fahrenheit and the potatoes are crisp.
Garnish with fresh chopped parsley and serve immediately.