Step 1

Preheat the oven at 325 °F / 165 °C / Gas Mark 3

Step 2

Smear a 9 x 13 casserole or baking pan with olive oil. Alternatively, you can also use a cooking spray. Set aside. Pro tip - the oil will prevent the chicken and potatoes from sticking to the pan so make sure to be generous.

Step 3

Thaw the chicken at least an hour before baking. Pat dry with a clean paper towel. Chop into 2-inch cubes - Set asidePro tip - Frozen or wet chicken will result in too much liquid in the finished dish

Step 4

In a cup or bowl, combine milk and cream with onion powder, garlic powder, chicken bouillon, and cornstarch - set aside.Pro tip - you will need to stir the mixture again before adding it as the cornstarch will settle to the bottom.

Step 5

Peel and chop potatoes into small 1-inch cubes. Set asidePro tip - if the potatoes are not small they will not cook at the same time as the chicken.

Step 6

In the baking casserole add the chicken, potatoes, and chopped parsley. Season with salt and pepper and make sure it is well distributed in the pan. Pro tip - you can mix this directly in the baking casserole or use a separate mixing bowl.

Step 7

Stir the milk and cream mixture one more time to mix the cornstarch again and evenly pour it all over the casserole.Pro tip - you can add flour instead of cornstarch which makes the gravy thicker.

Step 8

Sprinkle with the three kinds of grated cheeses starting with Parmesan, Cheddar, and Mozarella. Top with more fresh herbs if desired.

Step 9

Cover the casserole with foil and bake for an hour or until the potatoes are tender. Pro tip - if the potatoes are cut small they will cook in an hour or they may take a few minutes longer.

Step 10

Then remove the foil and bake further for 25 to 30 minutes until potatoes are fork-tender.Pro tip - cooking uncovered will evaporate excess moisture as well as give the cheese a lovely caramelized color on top. But, keep a close eye to not burn the cheese.

Step 11

This is best served hot with a side salad or side-dish of sauteed veggies.

Step 12

Leftovers can be reheated in the microwave, covered with a wet paper hand towel or kitchen cloth. Pro tip - The moisture in the paper towel helps hydrate the potatoes and chicken.