Finely dice the chicken breast, grate the cheese and add fresh herbs.
In another bowl, whisk together by hand the egg with salt, flour, sour cream and milk.
Add half of this mixture to the chicken and cheese and mix. Set the other half aside.
Grease a muffin tin with vegetable oil. Spoon in the chicken and cheese, then pour the remaining mixture on top to fill.
Bake at 180 °C (355 °F) for about 25 minutes, until the top turns golden.
Let the finished muffins cool and remove from the tin - ready to eat. Enjoy!