Preheat your oven to 375°F and lightly grease a 9x13 inch baking dish or similar size casserole.
While the oven heats, mince your garlic cloves, zest the lemon, then slice the lemon into thin rounds—set these aside.
Pat your chicken thighs dry with paper towels.
In a shallow bowl, whisk together the flour, parmesan, garlic powder, onion powder, half of your lemon zest, and a pinch of salt and pepper.
Heat olive oil in a large skillet over medium-high heat until shimmering, then coat each chicken thigh in the flour mixture.
Sear the chicken for 6 minutes per side until deeply golden brown.
In your prepared baking dish, combine the cream of chicken soup, chicken stock, rice, minced garlic, remaining lemon zest, and dried thyme.
Stir well to allow the rice to be mostly submerged in liquid.
Nestle the seared chicken thighs skin-side up into the rice mixture, and arrange lemon slices on and around the chicken.
Cover the dish tightly with foil and place in your preheated oven. Bake for 40-50 minutes.
Remove the foil and return to the oven for an additional 5-10 minutes.
Remove from the oven and let rest for 10 minutes.
Scatter fresh basil over the top and gently stir through the rice before serving.