Meat and potatoes in the oven with a very tasty crust!

One of our family's favorite meals! Meat and potatoes in the oven with a very tasty crust.

Ingredients:

Boneless chicken thighs – 800 gr.
Potatoes – 10-12 pcs.
Onion – 1 pc.
Garlic – 3 cloves.
Salt, ground black pepper – to taste.
Mayonnaise or sour cream – 100 gr.
Mozzarella – 150 gr.
Red onion – 1 pc.
Tomatoes – 2 pcs.
Pepper – 1 pc.
Parsley.