Do not defrost Chicken Breast! Make delicious Chicken Hash browns!

Do not defrost Chicken Breast! Make delicious Chicken Hash browns! A quick and delicious chicken dinner. This simple recipe will be a hit for your whole family!
Chicken breast - 2 pieces (425 g)
Potatoes - 2 pieces (425 g)
Onion - 1/2 piece
Egg - 1 piece
Salt - 1 teaspoon
Pepper - 1/2 teaspoon
Flour - 3 tablespoons
Mozzarella cheese - 70 gr
Butter - 30 g
Cooking oil - 30 ml