Begin by generously sprinkling salt and pepper over your chicken breasts. This will enhance their natural flavor and prepare them for cooking, so don’t rush this step!

In a large skillet, heat olive oil over medium-high heat. Once the oil shimmers, it’s ready for the chicken. This will ensure a beautiful golden brown crust!

Carefully place the seasoned chicken breasts in the skillet. Cook for 6-7 minutes on each side until they are golden brown and cooked through. Then remove them from the skillet and cover to keep warm.

In the same skillet, reduce the heat and add sliced onions. Sauté until they become translucent, around 3-4 minutes. This builds the base flavor of your sauce.

Toss in minced garlic and continue cooking for another 1-2 minutes. The aroma will fill your kitchen—what a delightful scent!

Carefully pour in the Irish whiskey to deglaze the skillet, scraping up all the flavorful bits stuck to the bottom. This step infuses the sauce with depth.

Allow the whiskey to simmer for about 5 minutes. This reduces the alcohol content and intensifies the flavor, creating a rich foundation for your sauce.

Add chicken broth to the skillet and let it simmer for another 5 minutes. This will enhance the heartiness of your sauce.

Gradually stir in heavy cream while continuously mixing. As it thickens, you’ll notice the lovely velvety texture developing—this is the magic moment!

Stir in Dijon mustard and fresh thyme, letting them meld into the sauce until it thickens up nicely, around 3-4 minutes.

Finally, reintroduce the chicken to the skillet, spooning the sauce over it. Let it simmer together for 2-3 minutes so the flavors unite beautifully.

Stir in a pat of butter right before serving. This adds a glossy finish and an extra layer of richness to your sauce.