Season the Chicken: In a large bowl, toss the cubed chicken breasts with the Italian seasoning, garlic powder, onion powder, salt, and black pepper until completely and evenly coated.
Sear Until Golden: Heat the extra virgin olive oil in a large stainless steel skillet over medium-high heat. Add the seasoned chicken bites in a single layer. Cook for 4–5 minutes, turning occasionally, until a golden-brown crust forms on all sides. Transfer the chicken to a side plate (it will finish cooking later).
Build the Sauce: Lower the skillet heat to medium. Add the minced garlic to the remaining oil and pan drippings, stirring constantly for 1 minute until fragrant. Pour in the chicken broth, using a wooden spoon to scrape all the caramelized bits from the bottom of the pan. Pour in the evaporated milk and add the julienned sun-dried tomatoes. Bring to a gentle simmer for 3 minutes to allow the liquid to reduce slightly.
Add the Vegetables: Stir the fresh baby spinach into the simmering liquid. Cook for 1–2 minutes, stirring gently, until the leaves are fully wilted into the sauce.
Finish Cooking: Remove the skillet entirely from the heat source. Whisk in the room-temperature Greek yogurt until a completely smooth, creamy ivory sauce forms. Return the seared chicken bites and their resting juices back into the skillet, letting the residual heat finish cooking the chicken through for 2 minutes.
Garnish and Serve: Sprinkle the freshly grated Parmesan cheese and lemon zest over the skillet. Give the mixture a gentle final stir to melt the cheese into the medium-thick sauce and serve immediately.