Season the chicken: In a bowl, toss chicken with 1 tablespoon oil, salt, pepper, garlic powder, onion powder, and smoked paprika. Coat evenly.
Sear the chicken: Heat a large skillet over medium-high.
Add the seasoned chicken and cook 5–7 minutes, stirring a few times, until browned and cooked through. Transfer to a plate and keep warm.
Cook the veggies: In the same skillet, add remaining 1 tablespoon oil. Add broccoli and zucchini with a pinch of salt.
Cook 4–5 minutes until tender-crisp and lightly browned.
Add aromatics: Push veggies to the edges. Melt butter in the center and add minced garlic. Cook 30 seconds until fragrant, then stir everything together.
Make the creamy base: Pour in chicken broth and simmer 1 minute.
Reduce heat to medium-low. Stir in cream cheese until smooth, then add heavy cream.
Add the cheese: Stir in mozzarella and parmesan until melted and silky. If the sauce seems too thick, splash in a bit more broth.
If too thin, simmer 1–2 minutes to reduce.
Finish with brightness: Return chicken and any juices to the skillet. Stir to coat. Add lemon juice and parsley.
Taste and adjust salt and pepper. Add red pepper flakes for a little heat if you like.
Serve: Spoon into bowls and eat as is, or serve over cauliflower rice or sautéed spinach for extra veg.