Pound and season: Lightly pound the chicken to an even 1/2–3/4 inch thickness for quick, even cooking.
Pat dry. Season both sides with salt, pepper, and Italian seasoning.
Sear the chicken: Heat the olive oil in a large nonstick or cast-iron skillet over medium-high. Add chicken and sear until golden, about 4–5 minutes per side.
Transfer to a plate; it will finish in the sauce.
Sauté aromatics: Lower heat to medium. In the same pan, add garlic and cook 30–45 seconds until fragrant. Don’t brown it.
Deglaze: Pour in the chicken broth, scraping up the browned bits.
Simmer 1–2 minutes to reduce slightly.
Build the lighter sauce: Stir in evaporated milk and sun-dried tomatoes. Simmer gently for 2–3 minutes.
Stabilize with yogurt: Remove the pan from heat. Whisk a few spoonfuls of the hot sauce into the Greek yogurt in a small bowl to temper it.
Then whisk the tempered yogurt back into the skillet over low heat.
Add Parmesan and heat gently: Stir in Parmesan until melted and the sauce is smooth. Keep the heat low to avoid curdling.
Finish the chicken: Return chicken to the skillet and spoon sauce over the top. Simmer on low 3–5 minutes, or until the internal temperature reaches 165°F (74°C).
Brighten and garnish: Stir in lemon juice, red pepper flakes (if using), and fresh basil.
Taste and adjust salt and pepper.
Serve: Plate chicken with plenty of sauce. Garnish with extra basil and a light sprinkle of Parmesan if desired.