Set your oven temperature to 375°F (190°C) to start warming up.
Evenly arrange the uncooked rice in a 9×13 inch baking dish for a uniform base.
Carefully pour the chicken broth or water over the rice, making sure not to stir it in.
Combine the Greek yogurt, minced garlic, grated cucumber, fresh dill, lemon juice, oregano, paprika, salt, and black pepper in a bowl to prepare the tzatziki sauce.
Dry the chicken breasts thoroughly with paper towels and brush them lightly with olive oil.
Position the chicken breasts on top of the rice layer.
Spoon a generous amount of the tzatziki mixture onto each piece of chicken, spreading it evenly.
Seal the baking dish tightly with aluminum foil to lock in moisture.
Place the dish in the oven and bake for 50 to 60 minutes until the chicken is cooked through and the rice is tender.
Remove the foil and let the dish sit for about 5 minutes to settle.
Serve warm, garnished with extra fresh dill or parsley and lemon wedges on the side.