Kosher salt and freshly ground black pepper, to taste
Egg noodles, for serving
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Instructions
1. Pat chicken breasts dry, cut into bite-sized pieces, and season with salt and pepper. Toss in flour until evenly coated.
2. Heat 2 tablespoons olive oil in a large skillet over medium-high heat. Add chicken in batches, cooking 2–3 minutes per side until lightly golden. Transfer to a plate.
3. Add remaining olive oil and butter to the skillet. Stir in mushrooms and onions, cooking 6–8 minutes until softened and caramelized.
4. Mix in dry mustard, Worcestershire sauce, and garlic. Cook for 1 minute until fragrant.
5. Pour in chicken broth, scraping up any browned bits for added flavor.
6. Return chicken to the pan. Simmer for 5–7 minutes until chicken is fully cooked and sauce reduces slightly.
7. Reduce heat to low. Stir in sour cream until the sauce is creamy and smooth. Adjust seasoning with salt and pepper.
8. Spoon over egg noodles or mashed potatoes. Garnish with fresh herbs if desired, and serve hot.