Start by slicing your chicken breasts into thinner cutlets, about 1.5 cm thick. Season both sides generously with salt and pepper.
Heat a large skillet over medium-high heat and add a tablespoon of butter. Once melted and shimmering, carefully lay in the chicken pieces.
Sear the chicken for about 3-4 minutes per side until golden brown and cooked through. Once done, transfer the chicken to a plate and set aside.
In the same pan, add another small pat of butter if needed, then toss in the finely chopped garlic. Sauté for about 30 seconds until fragrant, with a slightly nutty aroma filling the air.
Add sliced mushrooms to the pan and cook on medium heat. Stir often, allowing them to soften and turn a deep caramel brown, releasing rich earthy aromas, for about 5-7 minutes.
If using, pour in the white wine and scrape up any browned bits from the bottom of the pan. Let it cook for 2 minutes until reduced by half, intensifying the mushroom aroma.
Reduce the heat to low and pour in the heavy cream. Stir gently to combine, allowing the sauce to thicken and turn velvety, about 3-4 minutes. The sauce should coat the mushrooms smoothly.
Return the cooked chicken to the skillet, nestling it into the sauce. Warm everything together for 2 minutes, spooning sauce over the chicken for an even coating.
Finish by sprinkling chopped thyme or parsley on top, adding a final burst of freshness. Taste and adjust seasoning with more salt or pepper if needed.
Serve the creamy mushroom chicken hot, spooning generous amounts of sauce over each piece. Enjoy with crusty bread, rice, or your favorite side.