Create the crepe batter by whisking together milk, flour, eggs, and salt until smooth.
Let it rest for 15 minutes.
Meanwhile, melt butter in a pan and sauté garlic, onion, and mushrooms until the onion is tender.
Add the cubed chicken and cook until golden brown.
Stir in cream of chicken soup, simmer, and add spinach and cheese.
Continue stirring until the cheese is completely melted.
Prepare crepes in a separate non-stick skillet by pouring a small amount of batter and cooking both sides until lightly golden.
Repeat for all crepes.
Fill crepes with chicken mixture, fold over, and serve warm!
Feel free to sprinkle some extra cheese on top if desired.