One Pan Lemon Garlic Parmesan Chicken

3 tablespoons freshly squeezed lemon juice

 

1 teaspoon lemon zest

 

1/4 cup extra virgin olive oil

 

1/2 teaspoon oregano

 

1 teaspoon garlic powder

 

2 1/2 teaspoons kosher salt, divided

 

1 teaspoon freshly ground black pepper, divided

 

2 pounds red potatoes, cut into 1-inch cubes

 

3 boneless skinless chicken breasts

 

1 (8-ounce) package steam-in-bag green beans

 

3 tablespoons softened butter, divided

 

2 tablespoons mayonnaise

 

1/3 cup freshly grated Parmesan cheese

 

chopped fresh parsley for garnish