Dump-and-Bake Broccoli Cheddar Orzo Casserole (No Boiling Needed)

Dump-and-Bake Broccoli and Cheddar Orzo Casserole

This broccoli and cheddar orzo casserole starts with dry pasta, so there’s no pot of boiling water to manage. The orzo cooks in vegetable broth in a covered baking dish. Broccoli goes in partway through, when the pasta has absorbed some of the liquid but still needs time to finish. Stirring in the cheddar at the end gives the casserole a creamy texture without leaving the cheese in the oven long enough to turn oily.

The timing matters more than the assembly. Broccoli added at the start can become too soft before the orzo is done, while cheese baked under the foil for the full cooking time may separate. A brief pause to add the vegetables, followed by a final stir, keeps this a simple one-dish dinner.

Recipe at a glance

• Yield: About 4 servings
• Prep time: 10 minutes
• Cook time: About 35 to 45 minutes
• Total time: About 50 to 60 minutes, including resting
• Course: Main dish
• Cuisine: American-style
• Equipment: 9-by-13-inch baking dish, foil, spoon or spatula

Cooking time can vary with the baking dish, how tightly it is covered, and the size of the broccoli pieces. Check the pasta for doneness rather than relying on the clock alone.

Ingredients

• 1 tablespoon olive oil, for the baking dish
• 1½ cups dry orzo, about 9 ounces (255 g)
• 3 cups vegetable broth (710 ml), preferably low-sodium
• ½ cup whole milk (120 ml)
• 1 teaspoon Dijon mustard
• ½ teaspoon garlic powder
• ½ teaspoon onion powder
• ¼ teaspoon freshly ground black pepper
• 3 cups small fresh broccoli florets, about 9 ounces (255 g)
• 2 cups shredded sharp cheddar, about 8 ounces (225 g), divided
• Salt, to taste

Use a vegetable broth you like the taste of, since the orzo absorbs it as it cooks. Broths vary considerably in saltiness, so wait until the casserole is finished before adding salt. Sharp cheddar gives the dish a pronounced cheese flavor; shredding it from a block generally makes it easier to stir into the hot pasta than using packaged shreds.

How to make the casserole

1. Heat the oven and prepare the dish. Heat the oven to 375°F (190°C). Lightly oil a 9-by-13-inch baking dish.

2. Combine the uncooked ingredients. Add the dry orzo, vegetable broth, milk, Dijon mustard, garlic powder, onion powder, and black pepper to the dish. Stir thoroughly, spreading the orzo into an even layer. Cover the dish tightly with foil.

3. Bake the orzo first. Bake for 20 minutes. Remove the dish from the oven and carefully lift the foil away from you to avoid the steam. Stir the orzo, scraping along the bottom and into the corners so any pasta that has settled there is loosened.

4. Add the broccoli. Scatter the small florets over the orzo and press them gently into the hot liquid. Cover tightly again and return the dish to the oven for 15 to 20 minutes. The orzo should be tender, and the broccoli should be easily pierced with a fork. A little liquid may remain around the pasta.

5. Stir in the cheese. Remove the dish from the oven. Stir in 1½ cups of the cheddar, a handful at a time, until it melts into the orzo. Taste and add salt if needed. Sprinkle the remaining ½ cup cheddar over the top, cover loosely, and let the casserole stand for 5 minutes. The residual heat should melt the topping. If it needs more heat, return the uncovered dish to the oven briefly.

Serve while the orzo is creamy. It will thicken as it sits because the pasta continues to absorb liquid.

Why the broccoli goes in halfway through

Dry orzo needs time in hot liquid to cook. Small broccoli florets need much less time to become tender, especially when they are covered in a steamy baking dish. Adding both at the beginning can leave the broccoli dull and very soft by the time the pasta is ready.

The halfway point is a practical cue, not an exact deadline. After the first 20 minutes, the orzo will have started to swell, but there should still be liquid in the dish. Stirring at this stage also prevents pasta from remaining dry at the edges or sticking in a dense layer on the bottom. Once the broccoli is pressed into the liquid and the foil goes back on, it cooks alongside the orzo for the remaining time.

Cut fresh broccoli into small, fairly even florets. Large pieces may stay firm in the center while the pasta finishes. The stems are usable, too, if peeled where tough and cut into small pieces. Because stem pieces are denser than florets, add them with the orzo at the beginning or cut them small enough to cook during the second bake.

Can you use frozen broccoli?

Yes. Frozen broccoli works in this casserole without thawing, though its texture will usually be softer than fresh broccoli. Choose florets rather than large cuts with thick stems, and break apart any clumps before adding them.

Add frozen broccoli at the same halfway point used for fresh broccoli. It may cool the dish briefly, so the second bake could take a few extra minutes. Keep the foil snug and check that both the pasta and broccoli are hot and tender before adding the cheese. There’s no need to add extra liquid solely because the broccoli is frozen; it will release some moisture as it heats.

Getting the liquid and cheese right

For 1½ cups of dry orzo, this recipe uses 3 cups of broth plus ½ cup of milk. The broth provides most of the cooking liquid, while the milk contributes to the finished texture. Orzo brands and baking dishes can behave differently, so the useful test is the pasta itself: it should be tender, with enough moisture left to coat it once the cheese is stirred in.

If the orzo is still firm and the dish looks dry near the end of baking, stir in a small splash of hot broth or water, cover, and bake a little longer. If the pasta is tender but the casserole looks loose, stir it and let it stand for several minutes before deciding it needs more oven time. The liquid thickens as the pasta rests.

Cheddar belongs at the end of the bake. Stirring most of it into the hot orzo distributes it throughout the dish; reserving a little for the top gives the casserole a melted finish. The pasta should be hot enough to melt the cheese without a prolonged return to the oven. Avoid boiling the cheese into the liquid, which can make the sauce look grainy or oily.

Storage and reheating

Refrigerate leftovers in a covered container within two hours of cooking and use them within three to four days. The orzo will absorb more moisture in the refrigerator, so leftovers will be firmer than the freshly baked casserole.

To reheat, add a splash of water, milk, or broth and warm the orzo until hot throughout, stirring once or twice. A covered microwave-safe dish works well for individual portions. For a larger amount, cover a baking dish and reheat it in the oven, checking the center before serving. Add only enough liquid to loosen the pasta; too much will dilute the cheddar flavor.

A practical finish

This is a meatless casserole that can be served on its own, with broccoli mixed through every portion. The main checks are straightforward: keep the dish covered while the dry orzo cooks, add the broccoli after the pasta has had a head start, and wait until the end to stir in the cheddar. Once the orzo is tender, a short rest brings the remaining liquid and melted cheese together.