Prep the chicken: Pat the chicken dry. Season both sides with 1 teaspoon salt, 1/2 teaspoon pepper, Italian seasoning, and smoked paprika.
This helps build a flavorful crust.
Sear for color: Heat olive oil and 1 tablespoon butter in a large skillet over medium-high. Add chicken and sear 4–6 minutes per side until golden. Transfer to a plate.
The chicken will finish cooking in the sauce.
Sweat aromatics: Lower heat to medium. Add remaining butter. Stir in shallot and a pinch of salt; cook 2 minutes until soft.
Add garlic and cook 30 seconds until fragrant.
Tomatoes and fond: Add sun-dried tomatoes. Stir to coat and warm through, scraping up any browned bits. Those bits are flavor gold.
Deglaze and simmer: Pour in chicken broth.
Bring to a gentle simmer and reduce by about one-third, 2–3 minutes. This concentrates the sauce without extra heaviness.
Creamy base: Stir in half-and-half, Parmesan, and Dijon. Simmer gently 1–2 minutes until slightly thickened.
Season with remaining salt and pepper to taste.
Finish the chicken: Nestle the chicken and its juices back into the skillet. Simmer 4–6 minutes, turning once, until cooked through (internal temp 165°F/74°C). Don’t boil vigorously; keep it gentle.
Greens and brightness: Fold in spinach until just wilted, about 30–60 seconds.
Add lemon juice to lift the richness.
Garnish and serve: Top with chopped basil or parsley. Serve with rice, mashed potatoes, crusty bread, or zucchini noodles.