Put chicken breast onto a cutting board and season with salt, ground black pepper and garlic powder.
Heat oil in a large skillet, cook chicken until browned on both sides and cooked through over medium-heat, about 8-10 minutes per side ( depends on the size of chicken breasts/thighs). Transfer to a plate and cover with foil.
In the pan/skillet fry smoked beef until crisp, then transfer to a plate.
Heat 1 tbsp. of oil/butter in the same pan, add the chopped onion and fry until golden brown. Then add garlic, thyme, rosemary and sauté until fragrant, about 50-60 seconds.
Whisk in chicken broth, bring to a simmer and cook until liquid has reduced by half.
Stir in half and half, Dijon mustard and mix well. Bring to a simmer again, then add Parmesan cheese and cook until cheese melts and the sauce thickens.
Season the sauce with salt and pepper to taste.
Add the baby spinach and allow to wilt, then put the cooked chicken back to the skillet. Sprinkle with fresh parsley and top with fried smoked beef.
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