Dice the onion, carrot, and potato into cubes.
Cut the chicken into bite-sized pieces.
Melt butter in a pan and sauté the chicken.
Add the onion, carrot, and potato and stir-fry together.
Add flour and cook for 1-2 more minutes.
Pour in milk and chicken stock, then simmer until the ingredients are cooked through.
Right before finishing, add heavy cream and season with salt and pepper.