Chicken with Mashed Potatoes and Gravy

INGREDIENTS

skinless, boneless chicken breast halves

1 tsp

freshly ground black pepper, divided

1/4 tsp

salt, divided

1/4 cup

quick-mixing flour (such as Wondra), divided

2 tbsp

canola oil, divided

2 tbsp

unsalted butter, divided

1 1/2 cups

unsalted chicken stock (such as Swanson)

12 oz

frozen mashed potatoes (such as Ore-Ida Steam n' Mash)

1/3 cup

whole milk

2 tbsp

chopped fresh flat-leaf parsley