Cut the chicken fillet into small cubes.
Finely chop the mushrooms.
Grate the cheese on a fine grater.
Heat a frying pan, pour in vegetable oil and add chicken and mushrooms.
Fry the chicken and mushrooms for 5 minutes over medium heat. Add sour cream.
Mix everything and simmer for 3 minutes. Salt and pepper the filling.
Place the tartlets in a baking dish. Fill the tartlets with the chicken and mushroom filling.
Sprinkle the tartlets with grated cheese.
Place the tartlets in the oven to bake for 10 minutes.
Decorate the finished julienne with dill sprigs.