Name: One-Pan Hamburger Green Bean Casserole Recipe
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 1 pound Ground Beef; ½ Onion (Diced); 2 cans Cut Green Beans (Drained); 2 Tablespoon Butter; ¼ cup Flour; 1 cup Half & Half; 1 cup Beef Broth; ½ teaspoon Garlic Powder; ½ teaspoon Onion Powder; ½ teaspoon Black Pepper; ¾ teaspoon Salt; ¼ cup Sour Cream; ½ cup Shredded Cheddar Cheese; ½ cup Mozzarella Cheese; ¾ cup Fried Onion Straws (Optional)

Print Recipe· 4.2 from 2 reviews

If comfort food had a shining star, the One-Pan Hamburger Green Bean Casserole Recipe would take the spotlight every time. Imagine tender ground beef mingling with creamy, velvety sauce, vibrant green beans adding a fresh crunch, and a melty cheese blanket on top—all baked together in one dish for minimal fuss but maximum flavor. This casserole is a heartwarming crowd-pleaser that brings a delightful twist to a classic favorite, making it perfect for busy weeknights or cozy family dinners when you want something delicious but easy to throw together.

Ingredients You’ll Need

The image shows various ingredients arranged neatly on a white marbled surface, each in white bowls or clear measuring cups. On the top left, there is a wooden board with a piece of raw ground beef on white parchment paper, next to a small glass bowl with a pat of yellow butter. To the right, a white bowl is filled with green beans. Below, small white bowls hold different spices: black pepper, garlic powder, and onion powder on one plate, with salt in a bowl with a small wooden spoon nearby. A black bowl contains thick white sour cream, next to a white bowl full of crispy fried onion straws. In the center, a large white onion sits beside a glass measuring cup filled with dark brown beef broth and another with light cream labeled half & half. At the bottom right, a white plate holds shredded cheddar and mozzarella cheese side by side, with the cheddar cheese brightly orange and the mozzarella soft white. photo taken with an iphone --ar 4:5 --v 7

Keeping the ingredient list simple helps highlight the richness and freshness each element brings to this dish. Every single ingredient plays a vital role, whether it’s building flavor, adding creaminess, or providing that perfect pop of green color.

1 pound Ground Beef: The hearty protein base that adds savory depth and satisfying texture.
½ Onion (Diced): Adds a subtle sweetness and aromatic foundation when sautéed.
2 Tablespoons Butter: Enriches the sauce with a silky, lush mouthfeel.
¼ cup Flour: Essential for thickening the creamy sauce to the perfect consistency.
1 cup Half & Half: Brings a smooth, luscious creaminess without being too heavy.
1 cup Beef Broth: Adds moisture and deep, meaty flavor to the sauce.
½ teaspoon Garlic Powder: Gives a subtle savory kick without overpowering.
½ teaspoon Onion Powder: Enhances the onion flavor in a gentle and layered way.
½ teaspoon Black Pepper: Adds a mild heat and balances the richness.
¾ teaspoon Salt: Brings out all the natural flavors harmoniously.
2 cans Cut Green Beans (Drained): Provide a fresh, slightly crisp element to brighten the casserole.
¼ cup Sour Cream: Adds tang and a glossy finish to the sauce while keeping it creamy.
½ cup Shredded Cheddar Cheese: Melts perfectly for sharp, gooey cheesiness.
½ cup Mozzarella Cheese: Creates that irresistible stretchy texture on top.
¾ cup Fried Onion Straws (Optional): Offers an irresistible crispy topping that brings contrast in every bite.

How to Make One-Pan Hamburger Green Bean Casserole Recipe

Step 1: Cook the Ground Beef

Start by heating your Dutch oven or an oven-safe skillet over medium-high heat. Add the ground beef and cook it until it’s no longer pink, breaking it apart with a spoon so the meat is nicely crumbled. Don’t forget to drain any excess fat to keep the dish from being greasy. Once cooked through, transfer the beef to a bowl and set it aside for later. This step forms the savory heart of the casserole.

Step 2: Sauté the Onions and Make the Roux

In the same pan, melt your butter over medium heat. Toss in the diced onions and sauté them until they soften and become fragrant — about 3 minutes. Then sprinkle the flour over the onions and stir constantly for about a minute to cook out the raw flour taste. This creates the roux, which is the magic base that thickens your creamy sauce beautifully.

Step 3: Whisk in the Liquids and Thicken

Slowly pour in the half & half and beef broth while whisking continuously to prevent lumps. Let the sauce come to a gentle simmer and thicken for about 7 minutes. This gentle simmer transforms the mixture into a silky smooth sauce bursting with rich flavor, ready to bring everything together.

Step 4: Season and Combine

Add the garlic powder, onion powder, black pepper, and salt to the sauce and stir well. Next, fold the cooked beef, drained green beans, and sour cream into the sauce until everything shines with creamy goodness. If your pan isn’t oven-safe, transfer this delightful mixture to a casserole dish — but using one pan really simplifies the cleanup!

Step 5: Add Cheese and Onion Straws

Generously sprinkle the shredded cheddar and mozzarella cheeses evenly over the top of your mixture. For that extra crunchy finish and classic flair, sprinkle a layer of fried onion straws on top if you like. This final touch will have everyone reaching in for seconds.

Step 6: Bake to Perfection

Pop the casserole into your preheated oven at 350 degrees Fahrenheit and bake uncovered for about 30 minutes. Once bubbly and golden on top, let it rest for 5 minutes — this brief wait ensures every bite is perfectly set and delicious.

How to Serve One-Pan Hamburger Green Bean Casserole Recipe

A white pot with two handles is filled with three layers: the bottom layer is a creamy white sauce, the middle layer consists of cooked ground beef mixed with chopped onions, and the top layer has green beans on one half and two dollops of white sour cream on the other half. A wooden spoon is placed inside the pot on the sour cream side. Around the pot, on a white marbled surface, there is a white bowl with two types of shredded cheese (yellow and white) on the top right, a small dark bowl with a white sauce above the pot, a small white bowl containing salt with a small wooden spoon next to it, and a white bowl on a round wooden board with golden fried onions on the left, accompanied by some green leaves. A dark gray cloth is partially visible at the bottom left. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

A sprinkle of freshly chopped parsley or a few extra fried onion straws can elevate the presentation and add a pop of color and texture. The contrast of green and crispy golden bits makes the dish all the more inviting.

Side Dishes

This casserole shines wonderfully alongside a crisp green salad with a tangy vinaigrette to balance the richness. Garlic bread or warm dinner rolls also make nice companions, perfect for soaking up every last bit of that creamy sauce.

Creative Ways to Present

For a fun twist, serve individual portions in small oven-safe ramekins topped with cheese and onion straws. This makes for an impressive presentation at dinner parties or family gatherings while keeping the cozy vibe of the One-Pan Hamburger Green Bean Casserole Recipe.

Make Ahead and Storage

Storing Leftovers

Once cooled, cover your casserole tightly with plastic wrap or transfer leftovers to an airtight container. Stored in the refrigerator, it stays fresh for 3 to 4 days — perfect for easy lunches or reheated dinners.

Freezing

This dish freezes beautifully. Place it in a freezer-safe container or cover the baking dish tightly with foil and plastic wrap. It can be frozen for up to 2 months without losing its flavor or texture, making it ideal for meal prep and busy weeks.

Reheating

To reheat, thaw the casserole overnight in the fridge if frozen. Warm in a 350-degree oven for 20 to 25 minutes until heated through and bubbly. Alternatively, microwave individual servings for a quick, comforting meal ready in minutes.

FAQs

Can I use fresh green beans instead of canned?

Absolutely! Fresh green beans add a brighter flavor and improved texture. Just blanch them in boiling water for a few minutes before adding, so they’re tender but still crisp once baked.

Is it necessary to use both cheddar and mozzarella cheese?

Using a mix of cheddar and mozzarella gives a fantastic balance of sharp flavor and creamy stretchiness. However, you can definitely customize with your favorite cheeses; Monterey Jack or gouda would work great too!

Can I make this casserole vegetarian?

You can swap out the ground beef for a plant-based alternative or cooked lentils, and use vegetable broth instead of beef broth. The sauce and cheese will still deliver comforting flavor without the meat.

What is the purpose of the flour in the recipe?

The flour acts as a thickening agent when combined with butter to make a roux. It helps transform the half & half and broth into a creamy sauce that holds the casserole together perfectly.

Can I prepare this dish entirely on the stovetop without baking?

While you could serve it right after combining everything, baking allows the cheese to melt and brown nicely and the flavors to meld beautifully. It’s worth the extra 30 minutes for that perfect finish.

Final Thoughts

There’s something incredibly satisfying about a dish that combines simplicity with indulgence, like the One-Pan Hamburger Green Bean Casserole Recipe. It’s effortless to prepare, packed with flavor, and warm enough to make any meal feel like a special occasion. I can’t wait for you to try it out and see how it quickly becomes one of your all-time favorite comfort foods, too!