Cheesy Ground Beef & Mashed Potato Casserole

If you’re looking for an easy, comforting dinner that the whole family will enjoy, this Cheesy Ground Beef & Mashed Potato Casserole is a delicious choice. It combines seasoned ground beef, creamy mashed potatoes, and plenty of melted cheese in one hearty baked dish.

This casserole is simple enough for a weeknight meal but satisfying enough for a weekend family dinner. It’s also a great way to use leftover mashed potatoes.

Ingredients

For the Beef Filling

• 1 pound ground beef

• 1 small onion, finely chopped

• 2 cloves garlic, minced

• 1 cup frozen mixed vegetables

• 1 tablespoon tomato paste

• 1 cup beef broth

• 1 tablespoon Worcestershire sauce

• 1/2 teaspoon salt

• 1/2 teaspoon black pepper

• 1/2 teaspoon paprika

• 1/2 teaspoon dried Italian seasoning

• 1 tablespoon all-purpose flour

• 1 tablespoon olive oil, if needed

For the Mashed Potato Topping

• 4 cups mashed potatoes

• 2 tablespoons butter, melted

• 1/2 cup shredded cheddar cheese

• 1/4 cup milk, or as needed

• Salt and black pepper to taste

For the Topping

• 1 cup shredded cheddar cheese

• 1/4 cup shredded mozzarella cheese

• 1 tablespoon chopped fresh parsley, optional

How to Make Cheesy Ground Beef & Mashed Potato Casserole

1. Prepare the Oven

Preheat your oven to 375°F (190°C).

Lightly grease a 9-by-13-inch baking dish or a similar-size casserole dish.

2. Brown the Ground Beef

Heat a large skillet over medium-high heat.

Add the ground beef and cook, breaking it apart with a spoon or spatula, until browned and cooked through.

If there is a large amount of excess grease, carefully drain it from the skillet.

3. Add the Onion and Garlic

Add the chopped onion to the beef and cook for about 3–4 minutes, or until the onion begins to soften.

Stir in the minced garlic and cook for another 30 seconds.

Be careful not to burn the garlic.

4. Make the Savory Beef Filling

Sprinkle the flour over the beef mixture and stir well.

Cook for about one minute, then add the beef broth, tomato paste, Worcestershire sauce, paprika, Italian seasoning, salt, and black pepper.

Stir until everything is combined.

Add the frozen mixed vegetables and simmer for approximately 5–7 minutes, stirring occasionally.

The mixture should become thick and savory rather than watery.

Taste and adjust the seasoning if needed.

5. Prepare the Mashed Potatoes

Place the mashed potatoes in a bowl.

Stir in the melted butter, milk, salt, and black pepper until smooth and creamy.

If you’re using leftover mashed potatoes from the refrigerator, warm them slightly first. This makes them easier to spread over the beef filling.

For an extra cheesy topping, mix 1/2 cup of shredded cheddar directly into the mashed potatoes.

6. Assemble the Casserole

Spread the cooked ground beef mixture evenly across the bottom of the prepared baking dish.

Spoon the mashed potatoes over the beef.

Carefully spread the potatoes into an even layer, covering the filling completely.

Sprinkle the remaining cheddar and mozzarella cheese over the top.

7. Bake Until Golden and Bubbly

Place the casserole in the preheated oven.

Bake for approximately 25–30 minutes, or until the filling is hot and the cheese is melted and bubbling.

For a more golden top, switch the oven to broil for the final 1–2 minutes.

Watch it closely because cheese can brown quickly under the broiler.

8. Let It Rest

Remove the casserole from the oven and let it rest for about 5–10 minutes before serving.

This gives the layers a chance to settle and makes the casserole easier to scoop.

Garnish with chopped fresh parsley if desired.

Tips for the Best Ground Beef Casserole

Use Creamy Mashed Potatoes

Smooth mashed potatoes create the best topping. If your potatoes are very thick, add a little milk or cream before spreading them over the beef.

Don’t Leave the Beef Filling Watery

The beef mixture should be thick enough to hold the mashed potato topping.

If it looks too thin, allow it to simmer for a few extra minutes before assembling the casserole.

Season Every Layer

The beef, mashed potatoes, and cheese each contribute flavor. Season the potatoes separately rather than relying entirely on the beef mixture.

Use Plenty of Cheese

Cheddar provides a sharp, savory flavor, while mozzarella gives the casserole a wonderfully stretchy texture.

You can adjust the amount of cheese according to your preference.

Easy Variations

This casserole is easy to customize based on what you have available.

Add Bacon

Cook and crumble several slices of bacon and stir them into the beef mixture for a smoky, savory flavor.

Make It Spicy

Add a pinch of crushed red pepper flakes, diced jalapeños, or your favorite hot sauce to the beef filling.

Try Different Cheese

Cheddar isn’t your only option. You can also use:

• Monterey Jack

• Colby Jack

• Pepper Jack

• Gouda

• Mozzarella

• A Mexican-style cheese blend

Add More Vegetables

You can add extra vegetables such as diced carrots, corn, peas, mushrooms, or bell peppers.

Cook fresh vegetables with the onion before adding the remaining ingredients.

Use Ground Turkey

Ground turkey can be substituted for ground beef if you prefer a lighter-tasting casserole.

Because turkey can be less flavorful than beef, make sure to season the filling well.

Can I Use Leftover Mashed Potatoes?

Absolutely.

This recipe is an excellent way to transform leftover mashed potatoes into a completely different meal.

Cold mashed potatoes can be difficult to spread, so allow them to warm slightly and stir in a small amount of milk or butter to restore their creamy texture.

You can also add shredded cheese to the potatoes before spreading them over the beef.

Can I Make This Casserole Ahead of Time?

Yes.

Prepare the beef filling and mashed potato topping, then assemble everything in the baking dish.

Cover the casserole and refrigerate it until you’re ready to bake.

If the casserole is thoroughly chilled, it may require additional baking time. Make sure the center is heated through before serving.

For the best texture, add the cheese topping shortly before baking if you are preparing the casserole well in advance.

How to Store Leftovers

Allow leftover casserole to cool before transferring it to an airtight container or covering the baking dish.

Refrigerate leftovers and enjoy them within a few days.

Individual portions can be reheated in the microwave, while larger portions can be warmed in the oven.

If reheating in the oven, cover the casserole loosely with foil to prevent the cheese and potatoes from becoming overly browned.

Can You Freeze It?

Yes, this casserole can be frozen.

For best results, assemble the casserole in a freezer-safe dish and allow it to cool completely before freezing if the ingredients have already been cooked.

Wrap it tightly to prevent freezer burn.

Thaw the casserole in the refrigerator before reheating and make sure it is heated thoroughly before serving.

What to Serve With This Casserole

Because this dish already contains meat, potatoes, vegetables, and cheese, it can easily be served as a complete meal.

For a lighter side, consider:

• Green salad

• Steamed broccoli

• Roasted green beans

• Glazed carrots

• Simple cucumber salad

A piece of crusty bread can also be served alongside the casserole if you want an especially hearty dinner.

Frequently Asked Questions

Can I make this without vegetables?

Yes. You can leave out the mixed vegetables or replace them with your favorite vegetables.

What kind of potatoes work best?

Russet or Yukon Gold potatoes make excellent mashed potatoes because they become creamy and fluffy when prepared properly.

Can I use instant mashed potatoes?

Yes. Instant mashed potatoes can work when you’re short on time. Prepare them slightly thicker than usual so they hold their shape on top of the beef.

Why is my casserole watery?

The beef filling may contain too much liquid. Simmer it longer before assembling the casserole so excess moisture can evaporate.

Can I use only cheddar cheese?

Absolutely. Cheddar works very well on its own. Mozzarella is simply added for extra meltiness.

How do I get a crispy cheese topping?

Bake until the cheese is bubbling, then carefully broil the casserole for a minute or two. Keep a close eye on it to prevent burning.

Recipe at a Glance

Prep Time: 20 minutes
Cook Time: 30 minutes
Total Time: About 50 minutes
Servings: 6–8
Difficulty: Easy

Final Thoughts

This Cheesy Ground Beef & Mashed Potato Casserole is the kind of comforting homemade meal that makes a busy evening feel a little easier. The savory beef and vegetable filling is topped with creamy mashed potatoes and a generous layer of melted cheese for a satisfying combination of flavors and textures.

It’s also flexible enough to adapt to your family’s preferences. Add extra vegetables, switch up the cheese, make it spicy, or use leftover mashed potatoes to create a delicious meal without complicated preparation.

Serve it hot from the oven with a simple green salad or your favorite vegetable side, and you’ve got an easy dinner that’s hearty, cozy, and perfect for sharing.