Season both sides of the chicken breasts with kosher salt and black pepper. Heat 2 tablespoons (30 mL) of avocado oil in a large skillet over medium heat. Add the chicken and cook for 5–7 minutes per side, until golden brown and cooked through, reaching an internal temperature of 165°F (74°C). Remove the chicken from the skillet and set aside.
4 (about 1½–2 pounds / 680–900 g total) skinless boneless chicken breasts, 1 tsp (5 g) kosher salt, ½ tsp (1 g) black pepper, 3 tbsps (45 ml) avocado oil
In the same skillet, add the remaining 1 tablespoon (15 mL) of avocado oil if needed. Add the diced onion and cook for about 4 minutes, stirring occasionally, until softened. Stir in the sun-dried tomatoes and minced garlic and cook for 1–2 minutes, just until fragrant.
¼ cup (40 g) finely diced yellow onion, ½ cup (75 g) sliced sun-dried tomatoes in oil, 4 cloves garlic
Reduce the heat to medium-low and add the heavy cream, chicken broth, grated Parmesan cheese, Italian seasoning, paprika, and garlic powder. Stir to combine and let the sauce simmer gently for 3–5 minutes, stirring occasionally, until it begins to thicken and the Parmesan has fully melted into the sauce.
1¼ cups (300 ml) heavy cream, ¼ cup (60 ml) low-sodium chicken broth, ¼ cup (25 g) grated Parmesan cheese, 1 tsp (2 g) Italian seasoning, ¼ tsp (0.5g) paprika, ¼ tsp (0.5g) garlic powder
Stir in the lemon juice, then continue simmering for another 1–2 minutes, allowing the sauce to thicken slightly further so it coats the back of a spoon.
juice of ½ a lemon
Add the spinach and cook for 1–2 minutes, just until wilted and incorporated into the sauce.
2-3 cups (60-90 g) baby spinach
Return the chicken to the skillet and spoon the sauce over the top. Let everything simmer together for 3–5 minutes, allowing the sauce to reduce slightly more and fully coat the chicken before serving.