Preheat the oven to 375°F.
In a 9x13 baking dish, whisk together the orzo, chicken broth, heavy cream, lemon juice, lemon zest, minced garlic, capers, cubed butter, seasoning, salt, and pepper until combined.
Place the thin-cut chicken breasts on top of the orzo mixture.
In a small bowl, combine the panko, grated Parmesan, melted butter, and lemon zest. Mix until the breadcrumbs are evenly coated. Press a thick, even layer of the topping onto each chicken breast.
Cover the baking dish tightly with foil and bake for 35 to 40 minutes.
Remove the foil and bake for another 10 to 15 minutes, or broil for 2 to 3 minutes, until the topping is deeply golden and crispy.
Let rest for 5 minutes. Gently stir the orzo around the chicken before serving.
Finish with fresh parsley, extra Parmesan, and a squeeze of fresh lemon.