1. Start by seasoning your chicken breasts generously with salt, pepper, and smoked paprika if using. This little touch of paprika adds a lovely warmth that complements the whiskey beautifully.
2. Heat the olive oil and butter in a large skillet over medium-high heat. The mix of oil and butter gives a nice balance of flavor and helps prevent the butter from burning—something my grandma always taught me.
3. Add the chicken breasts to the pan and sear for about 5-6 minutes on each side until they develop a golden-brown crust and are cooked through. The internal temperature should reach 165°F. Avoid overcrowding the pan to ensure a good sear.
4. Remove the chicken from the skillet and set aside on a warm plate. Don’t wipe the pan just yet; those browned bits are gold for the sauce.
5. In the same skillet, add the chopped onion and sauté for about 3 minutes until softened and translucent. Then stir in the minced garlic and cook for another 30 seconds until fragrant.
6. Carefully pour in the whiskey, scraping the bottom of the pan to lift those flavorful browned bits. Let the whiskey simmer for 2-3 minutes to reduce slightly and mellow out the alcohol’s sharpness.
7. Add the chicken broth and Dijon mustard, stirring to combine. Let this simmer for another 3-4 minutes, allowing the sauce to reduce and thicken a bit.
8. Lower the heat to medium-low, then slowly pour in the heavy cream while stirring. Let the sauce simmer gently for 5-7 minutes until it thickens to your desired consistency. Stir occasionally to prevent it from sticking or curdling.
9. Return the chicken breasts to the skillet and spoon the sauce over them. Let everything warm through for another 2-3 minutes, allowing the chicken to soak up the creamy goodness.
10. Finish with a sprinkle of fresh parsley for a pop of color and a hint of brightness.

From experience, letting the sauce thicken slowly is key. Rushing it can lead to a thinner sauce or even curdling, and that’s not the cozy, comforting meal we’re after.