Prep the chicken: Pat chicken dry. Slice breasts horizontally to make cutlets if they’re thick.
Season both sides generously with salt, pepper, and half the Italian seasoning.
Sear the chicken: Heat 1 tablespoon olive oil and 1 tablespoon butter in a large skillet over medium-high heat. Add chicken in a single layer. Sear 4–5 minutes per side until golden and just cooked through.
Transfer to a plate and tent with foil.
Sauté aromatics: Lower heat to medium. Add remaining olive oil and butter if the pan looks dry. Stir in garlic and sun-dried tomatoes.
Cook 30–60 seconds until fragrant, scraping up browned bits.
Build the sauce: Pour in chicken broth. Simmer 1–2 minutes to reduce slightly. Add cream and remaining Italian seasoning.
If you want it a bit spicy, sprinkle in red pepper flakes.
Thicken and enrich: Stir in Parmesan until melted and smooth. If you prefer a thicker sauce, whisk cornstarch with a tablespoon of cold water to make a slurry, then whisk into the simmering sauce. Cook 1–2 minutes until it lightly coats a spoon.
Add greens: Stir in spinach.
Let it wilt, about 1 minute. Taste and adjust with salt and pepper. A tiny squeeze of lemon brightens everything—use sparingly.
Return chicken to pan: Nestle the chicken into the sauce, along with any plate juices.
Spoon sauce over the top and simmer on low for 2–3 minutes to marry flavors.
Assemble meal prep: Divide your chosen sides into 4 meal prep containers. Top with a chicken piece and spoon over a generous amount of sauce, tomatoes, and spinach. Let cool uncovered for 15–20 minutes before sealing.