Preheat the oven to 425°F (220°C) and lightly grease a baking dish with avocado oil.
Peel the yellow potatoes and cut them into evenly sized pieces. Place them in a large pot of salted boiling water and cook until fork-tender, about 15-20 minutes.
Drain the potatoes and return them to the pot. Add the Parmigiano cheese, milk, salt, and pepper. Mash until smooth and creamy. Allow to cool slightly before shaping into six equal balls and creating nests.
In a large skillet, heat a splash of avocado oil over medium heat. Add the chicken pieces and cook for about 4-5 minutes until browned. Then, add the onion, garlic, bell pepper, paprika, oregano, and tomato paste. Stir and cook for another 3-4 minutes until the chicken is cooked through and vegetables are tender.
Spoon the chicken mixture into each potato nest and sprinkle with shredded mozzarella cheese.
Bake in the preheated oven for 15-20 minutes until the cheese is melted and golden brown.
Remove from the oven and let cool for a few minutes before serving.
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Notes
Serve warm, garnished with fresh herbs if desired!