Chicken cutlets/steaks are available in most supermarkets, but you can slice a chicken breast in half and get the same result.
To slice chicken breasts into thin cutlets: Place a chicken breast down flat on a cutting board. Hold one hand flat on top of the breast, and use a sharp knife to cut the breast in half, parallel to the cutting board.
Typically, that is all you need to do! The cutlets should be about ¼ inch in thickness. If they are thicker than that, use a meat mallet to pound them down thinner.
Boneless and skinless chicken thighs can be used in place of chicken breasts, but keep in mind that they take longer to cook.
When sauteing the garlic, add a little bit of sundried tomato oil for more flavor.
Do not use half and half/single cream as that won’t thicken the sauce enough.
I recommend buying a block of parmesan cheese and grating it yourself. I found that store-bought parmesan cheese doesn’t have much flavor, and doesn’t melt well in sauces.