Preheat the oven to 200 degrees Celsius (390 Fahrenheit).
Peel and chop the potatoes into cubes, add the olive oil, one teaspoon of paprika, one teaspoon of garlic granules, a pinch of salt and pepper, and toss well to coat.
Arrange the potatoes onto an oven-proof dish, and bake for 20 minutes.
Cut the chicken breasts into chunks, add add the remaining olive oil, salt, pepper, paprika and garlic granules.
Add the chicken pieces to the potatoes together with the butter cut into small cubes, and bake for a further 35-40 minutes or until the chicken is cooked through and the potatoes are tender.
Mix the potatoes and chicken now and then to make sure they bake evenly.
Top with grated cheese, and bake for 5 more minutes so that the cheese can melt.
Remove from the oven and garnish with fresh parsley.