Slice the chicken breasts lengthwise and season with salt, pepper, and garlic powder. Dredge in flour.
Heat olive oil and butter in a large skillet over medium-high heat. Sear the chicken for 4-5 minutes per side until golden brown. Remove and set aside.
Deglaze the pan with chicken broth and stir in Dijon mustard. Scrape up browned bits and simmer for 1-2 minutes.
Add heavy cream, spinach, and sun-dried tomatoes to the skillet. Stir until spinach wilts.
Return the chicken to the skillet, spoon sauce over it, and cook for another 5 minutes until fully cooked and sauce thickens.
Stir in chopped basil just before serving. Adjust seasoning if needed.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stove.