Start by placing the chicken breasts on a clean cutting board and, using a sharp knife, carefully slice each breast horizontally to create thinner, even pieces. This helps the chicken cook faster and more evenly. Once sliced, pat them dry with a paper towel so they sear properly. Season both sides generously with salt and freshly ground black pepper, gently pressing the seasoning into the surface so it sticks well.
Place a large pan or skillet over medium-high heat and add the oil. Allow the oil to heat up until it shimmers slightly—this means it’s ready. Carefully place the chicken pieces into the pan in a single layer, making sure not to overcrowd them. Let them cook undisturbed for about 4–5 minutes on the first side until a golden-brown crust forms, then flip and cook the other side for another 4–5 minutes until fully cooked through. The chicken should feel firm to the touch and have a nice color.
Once the chicken is cooked, transfer it to a plate and let it rest. This resting step helps the juices redistribute inside the meat, keeping it tender and moist. Do not wipe the pan—you want to keep all those browned bits at the bottom because they add a lot of flavor to the sauce.
Reduce the heat to medium and add the butter to the same pan. Let it melt slowly, then add the minced garlic. Stir continuously for about 30–60 seconds until the garlic becomes fragrant and lightly golden. Be careful not to burn it, as burnt garlic can turn bitter very quickly.
Pour in the broth and immediately use a wooden spoon or spatula to scrape the bottom of the pan. This step lifts all the caramelized bits stuck to the pan (called fond), which adds deep, rich flavor to your sauce. Let the broth simmer for a minute so it slightly reduces.
Slowly pour in the cream while stirring continuously. Keep the heat at medium-low and allow the mixture to come to a gentle simmer—not a boil. Stir occasionally and watch as the sauce begins to thicken slightly and turn smooth and creamy.
Add the grated parmesan cheese along with your seasoning. Stir well so the cheese melts completely into the sauce, making it thicker and richer. Let the sauce simmer for another 2–3 minutes, stirring occasionally, until it reaches a silky, slightly thick consistency that can coat the back of a spoon.
Return the cooked chicken back into the pan, placing each piece into the sauce. Spoon the creamy garlic sauce over the chicken so it gets fully coated. Let it simmer gently for 2–3 minutes so the chicken absorbs the flavors and warms through again.
Once everything is well combined and heated, turn off the heat. Let the dish sit for a minute or two so the sauce settles slightly. Serve the chicken warm, making sure to spoon plenty of the creamy garlic sauce over each portion for the best flavor and presentation.