This easy broccoli rice and cheese casserole is a creamy, comforting dinner made with cooked white rice, thawed broccoli, condensed cream of mushroom soup, sour cream or mayonnaise, sautéed onion, butter, and sharp cheddar cheese. Assemble it in about 15 to 20 minutes, then bake at 350°F for 25 to 35 minutes until hot, bubbling, and golden on top.
Each spoonful delivers tender rice, savory broccoli, sweet softened onion, and a rich blanket of melted cheddar. The casserole makes about 6 servings, works beautifully with leftover rice, and is a dependable side dish or meatless main course for busy weeknights, potlucks, and cozy family dinners.
Jump to RecipeWhy You’ll Love This Recipe
There is a reason broccoli, rice, and cheese remain such a popular combination: the flavors are familiar, satisfying, and wonderfully balanced. The rice gives the casserole a soft, hearty base, while broccoli adds color and a tender vegetable bite to every serving.
Condensed cream of mushroom soup creates the savory sauce without requiring a separate roux. Sour cream gives the filling a gentle tang, while mayonnaise makes it especially rich and smooth, so you can choose whichever ingredient is already in your refrigerator.
This casserole is also wonderfully practical. It uses frozen broccoli, pantry-friendly rice, and a short list of everyday ingredients, making it an easy choice when you need dinner on the table without a complicated preparation routine.
If you enjoy this flavor combination, you can also take a look at our cheesy broccoli casserole for another comforting way to serve this classic vegetable.
Ingredients You’ll Need
The recipe begins with 2 cups of cooked white rice, preferably long-grain. Long-grain rice keeps its shape nicely and gives the finished casserole a pleasant texture, but leftover white rice is also an excellent shortcut. Cool rice from the refrigerator can go directly into the mixing bowl.
Use 16 ounces of frozen chopped broccoli, thawed and well drained. Frozen broccoli is convenient and dependable, but excess water can thin the creamy sauce, so press it gently in a colander or squeeze it in a clean kitchen towel before mixing.
- For the creamy filling: one 10.5-ounce can of condensed cream of mushroom soup and 1/2 cup sour cream or mayonnaise.
- For flavor: 1/2 cup finely chopped yellow onion, 2 tablespoons butter, 1/2 teaspoon salt, and 1/4 teaspoon black pepper.
- For the cheese layer: 1 cup shredded sharp cheddar, divided between the filling and the top.
- For optional adjustments: up to 1/2 cup milk or chicken broth if the mixture is unusually thick.
- For an optional topping: 1/2 cup additional shredded cheddar or 1/2 cup buttered cracker crumbs.
Freshly shredding the cheddar is worth the small effort because it generally melts more smoothly than pre-shredded cheese. Sharp cheddar supplies enough flavor to stand up to the creamy soup and rice without requiring a long list of seasonings.
How to Make It Step-by-Step
Step 1: Heat the oven to 350°F and grease a 2-quart casserole dish or a 9-by-13-inch baking dish. If you are starting with uncooked rice, prepare it according to the package directions first, allowing enough time for it to be cooked and ready before assembly.
Step 2: Thaw the frozen broccoli completely, then drain and press away as much water as possible. This step matters because trapped moisture releases during baking and can make the finished casserole thin instead of creamy.
Step 3: Melt the butter in a skillet over medium heat and add the finely chopped yellow onion. Sauté for about 3 to 5 minutes, stirring occasionally, until the onion is soft and fragrant but not deeply browned.
Step 4: Place the cooked rice, drained broccoli, condensed cream of mushroom soup, sour cream or mayonnaise, softened onion, salt, black pepper, and 3/4 cup of the shredded cheddar in a large bowl. Stir gently but thoroughly so the soup coats the rice and broccoli without crushing the grains.
Step 5: Check the consistency before transferring the mixture to the dish. It should be moist and creamy but not soupy; if it feels very stiff, stir in a small amount of milk or chicken broth, using up to 1/2 cup as needed.
Step 6: Spread the mixture evenly in the greased baking dish and smooth the surface with the back of a spoon. Sprinkle the remaining 1/4 cup cheddar over the top, then add optional buttered cracker crumbs or additional cheddar if you want a more substantial crust.
Step 7: Cover the casserole with foil and bake for 20 minutes. Remove the foil and continue baking for another 5 to 15 minutes, until the center is hot, the edges are bubbling, and the cheese has melted into a golden layer.
Step 8: Let the casserole stand for a few minutes before serving. This short rest helps the creamy filling settle, making it easier to scoop neat portions while keeping the interior soft and luscious.
Chef’s Tips for the Best Texture
Thoroughly draining the broccoli is the most important preparation tip. If the florets are still wet after thawing, place them in a colander and press gently, or wrap them in a clean towel and pat them dry.
Do not add the optional milk or broth automatically. The condensed soup, sour cream, and moisture in the broccoli already provide plenty of creaminess, so add liquid only when the mixture looks unusually dense and difficult to stir.
For the richest cheese flavor, use sharp cheddar and shred it yourself. Mild cheddar also works, but sharp cheddar provides a more noticeable contrast to the mellow rice and creamy mushroom sauce.
Keep the foil on for the first 20 minutes so the casserole heats through without drying on top. Removing it for the final 5 to 15 minutes allows the cheese to melt fully and gives the surface an inviting baked finish.
For another family-friendly baked dinner idea, pair this casserole with our chicken and potato casserole when you are planning a comforting oven meal.
Easy Variations and Serving Ideas
This recipe is designed around cooked regular rice because it gives the most predictable texture. Some casseroles use uncooked instant or converted rice, but those versions require their own precise liquid amounts and baking directions. Instant rice and regular rice should not be swapped casually.
You can replace the cream of mushroom soup with cream of chicken, cream of broccoli, or cream of celery soup. Each option changes the flavor slightly while preserving the same creamy structure and simple preparation.
Processed cheese or Velveeta can be used in versions that call for it, although shredded sharp cheddar gives this recipe a pleasantly savory flavor and a classic melted topping. Sour cream creates a tangier finish, while mayonnaise makes the filling especially rich.
Serve it as a meatless main dish with a crisp green salad, or spoon it beside roasted chicken, pork, or baked fish. For a casual gathering, warm soft Hawaiian rolls make a wonderful accompaniment for catching every bit of creamy sauce.
If you are building a make-ahead breakfast spread for another day, our ham and cheese breakfast bombs are a fun recipe to keep in mind. They are not part of this casserole, but their cheesy, comforting style fits the same family-friendly menu.
Storage and Reheating
Cool leftover casserole, cover the baking dish tightly, and refrigerate it. It is best enjoyed within a few days, and the creamy rice mixture may firm up slightly once chilled.
Reheat individual portions in the microwave until hot, or warm a larger amount in a covered oven-safe dish. If the top begins to dry during oven reheating, keep it covered with foil and remove the foil briefly at the end.
When preparing the casserole ahead of time, assemble it in the greased dish, cover it, and refrigerate it until you are ready to bake. Because the dish starts cold, allow extra attention during baking and check that the center is fully hot and bubbling before serving.
For a completely different cozy dinner option on another night, try our ground beef chili in a bread bowl. It brings the same hearty comfort in a saucy, spoonable format.
What to Look for When It’s Done
The finished casserole should be hot throughout, with bubbling edges and melted cheddar across the surface. The rice should remain tender and distinct rather than watery, while the broccoli should be soft enough to cut easily with the side of a spoon.
If the top is melted but the center still feels cool, cover the dish again and continue baking until heated through. Oven temperatures and dish materials can vary, so the visual signs of bubbling and a fully hot center are more useful than relying on the clock alone.
Allowing the casserole to rest for a few minutes makes serving easier. It also gives the sauce a chance to cling to the rice and broccoli instead of running across the plate.
Easy Broccoli Rice and Cheese Casserole
Ingredients
Method
- Heat the oven to 350°F and grease a 2-quart casserole dish or 9-by-13-inch baking dish. Cook the rice according to package directions if you are not using leftover cooked rice.
- Thaw the frozen chopped broccoli and drain it thoroughly, pressing away excess water. Melt the butter in a skillet, sauté the chopped onion for 3 to 5 minutes until softened, and remove from the heat.
- In a large bowl, combine the cooked rice, broccoli, condensed cream of mushroom soup, sour cream or mayonnaise, sautéed onion, salt, black pepper, and 3/4 cup of the cheddar cheese. Add a little milk or chicken broth only if the mixture seems very thick.
- Spread the mixture into the prepared baking dish and smooth the top. Sprinkle with the remaining cheddar and add buttered cracker crumbs if desired.
- Cover the dish with foil and bake for 20 minutes. Uncover and continue baking for 5 to 15 minutes, until the casserole is hot and bubbling and the cheese is fully melted.
Notes
Final Thoughts
This easy broccoli rice and cheese casserole is the kind of dependable dinner recipe that earns a regular place in the rotation. With cooked rice, frozen broccoli, creamy soup, a little onion, and plenty of cheddar, it delivers a warm, savory meal with very little fuss.
Remember the two details that make the biggest difference: drain the broccoli thoroughly and use cooked rice unless you are following a separate recipe written specifically for uncooked rice. Once assembled, the casserole needs only a covered bake followed by a short uncovered finish for a bubbling, cheesy top.
Serve it fresh from the oven as a meatless main dish or alongside your favorite protein. Whether it is made for a weeknight dinner, a holiday table, or a neighborhood potluck, this creamy broccoli and rice bake brings familiar ingredients together in a dish that is easy to prepare and wonderfully satisfying.