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Season the chicken breasts with salt, pepper, onion powder, and garlic powder on both sides.
Heat olive oil in a large skillet over medium-high heat. Once the oil is hot, add the chicken breasts and cook for about 5-7 minutes per side, until golden brown and cooked through. Remove the chicken from the skillet and set aside.
Ranch Sauce
In the same skillet, lower the heat to medium. Add the garlic and onion and sauté for 2-3 minutes, until fragrant and softened. Stir in the ranch seasoning mix and chicken broth. Scrape the bottom of the skillet to loosen any tasty bits left from the chicken.
Once the broth begins to simmer, add the milk and sour cream. Stir until the sauce is smooth. Simmer for 3-4 minutes for the sauce to thicken slightly.
Stir in the Dijon mustard, then let the sauce cook for another 2-3 minutes. Seasoning with salt and pepper if needed.
Finiish
Return the chicken breasts to the skillet, spooning the creamy ranch sauce over the chicken. Simmer on low heat for 5-7 minutes, allowing the chicken to absorb the flavors and become more tender.