Preheat your oven to 375°F (190°C). Yes, we’re starting with heat because cold casserole is sad.
In a skillet, melt butter over medium heat. Sauté onion and garlic until fragrant and translucent—about 3 minutes.
Add chicken pieces. Cook until lightly browned on the outside; they’ll finish cooking in the oven, so don’t worry about raw in the middle.
Stir in paprika, salt, and pepper. Give it a quick toss so every piece gets a little personality.
In a large mixing bowl, combine chicken, rice (uncooked), vegetables, broth, and milk. Mix until everything is evenly distributed. It’ll look like a cozy casserole universe coming together.
Pour the mixture into a greased baking dish. Top with shredded cheese for that molten, melty top.
Bake for 40–45 minutes, until the rice is tender and the chicken is cooked through. If the top browns too fast, tent with foil for the last 10 minutes.
Remove from oven, let it rest 5 minutes, then sprinkle with optional parsley or thyme. Serve and pretend you didn’t just conquer dinner in one dish.