Cheesy broccoli rice bake combines tender broccoli, fluffy rice, and a creamy cheese sauce in a vegetarian family casserole. This comfort food classic is a holiday side dish staple that everyone reaches for.
Preheat your oven to 350°F and lightly grease a 2-quart baking dish.
Steam the broccoli florets for 3–4 minutes until bright green and just tender, then drain well to avoid excess moisture.
In a large skillet over medium heat, melt the butter, then add chopped onion and cook until soft, about 3 minutes.
Add flour to the skillet and whisk constantly for 1 minute until bubbly; slowly pour in the milk while whisking to make a smooth sauce.
Stir in salt, pepper, and garlic powder, then reduce heat to low; add 1 ½ cups cheddar cheese and stir until fully melted.
In a mixing bowl, combine cooked rice, steamed broccoli, and the cheese sauce; fold together gently for even distribution.
Transfer mixture into the prepared baking dish, top with the remaining ½ cup cheddar cheese, and bake uncovered for 25–30 minutes until golden and bubbling at the edges.
Let the casserole cool for 8–10 minutes before serving to set the structure and enhance flavors.