If you’ve followed us for a while, you know Larissa and I don’t always agree on food. She tends to be pickier and that’s totally okay. To each her own!. But one thing we both absolutely love? A good loaded baked potato casserole. Cheesy, creamy, comforting…it’s hard to go wrong.
This vegetarian loaded baked potato casserole takes everything we love about the classic loaded baked potato—sharp cheddar, green onions, and a dollop of sour cream—and bakes it into one bubbling, golden dish. It’s hearty without being too heavy, and the colorful veggie add-ins make it feel just a little more wholesome (because broccoli counts as balance, right?).
It’s easy to prep, great for make-ahead meals, and makes enough to feed a hungry family or a group of friends. And the leftovers? Even better the next day.
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Why This Loaded Baked Potato Casserole Recipe Is awesome
- Layered flavor Roasted potatoes, savory veggies, and a creamy sauce give you comfort in every bite.
- Balanced texture Tender potatoes meet melty cheese and a crisp topping.
- Easy technique No complicated steps—just roast, mix, and bake.
- Flexible and forgiving Swap cheeses, use different veggies, or adjust the dairy to your taste.
- Make-ahead friendly Assemble earlier in the day or the night before and bake when you’re ready.
Ingredients
- Russet or Yukon Gold potatoes
- olive oil
- kosher salt
- black pepper
- garlic powder
- smoked paprika (or sweet paprika)
- sour cream (or plain Greek yogurt; use plant-based to make it vegan)
- whole milk (or 2% milk or plant milk)
- sharp cheddar cheese (use vegan cheese if desired)
- mozzarella or Monterey Jack (regular or vegan)
- green onions
- red bell pepper
- broccoli florets (fresh or thawed frozen)
- canned corn (optional)
- unsalted butter (or vegan butter)
- panko or regular breadcrumbs
- dried parsley or Italian seasoning
- Optional garnish: extra sour cream, hot sauce, chives, vegan bacon bits
How to Make It
Preheat and prep
Heat your oven to 425°F (220°C). Line a large baking sheet with parchment for easy cleanup. Lightly grease a 9×13-inch casserole dish and set it aside.
Season the potatoes
In a large bowl, toss the potato cubes with olive oil, salt, pepper, garlic powder, and smoked paprika. Spread them out in a single layer on the prepared baking sheet.
Roast until golden
Roast for 25–30 minutes, flipping once halfway through, until the potatoes are tender and golden brown at the edges.
Soften the veggies
While the potatoes roast, sauté the diced bell pepper in a small skillet with a splash of olive oil and a pinch of salt for 3–4 minutes, just until slightly softened. If using broccoli, steam or microwave it until crisp-tender. Set aside.
Make the creamy base
In a large bowl, whisk together the sour cream and milk until smooth. Stir in 2 cups of the cheddar, all of the mozzarella, and half the green onions. Taste and season with a bit more salt and pepper if needed.
Combine the filling
Add the roasted potatoes, sautéed bell pepper, broccoli, and corn (if using) to the bowl. Gently fold everything together so the potatoes stay intact but well coated.
Layer and top
Transfer the mixture to the prepared casserole dish. Sprinkle the remaining 1 cup of cheddar evenly over the top.
Mix the crunchy topping
In a small bowl, stir together the melted butter, breadcrumbs, and dried parsley or Italian seasoning. Sprinkle the mixture evenly over the cheese layer.
Bake
Reduce the oven temperature to 375°F (190°C). Bake the casserole for 20–25 minutes, until the cheese is melted and the topping is golden and crisp.
Rest and garnish
Let the casserole rest for 10 minutes before serving to help it set. Sprinkle with the remaining green onions. Add dollops of sour cream, hot sauce, or fresh chives if you’d like.
Storage Instructions
- Refrigerator Cool completely, then cover tightly. Store for 3–4 days.
- Reheat Warm individual portions in the microwave until hot, or reheat the whole dish covered with foil at 350°F (175°C) for 15–20 minutes.
- Freezer Assemble without the breadcrumb topping, wrap well, and freeze for up to 2 months. Thaw overnight in the fridge, add the topping, and bake as directed.
- Make-ahead Assemble up to 24 hours in advance. Cover and refrigerate, then bake just before serving. Add a few extra minutes if baking straight from the fridge.
Benefits of This Recipe
- Vegetarian comfort food Satisfying and cozy, without relying on meat for flavor.
- Customizable Works with many vegetables and cheeses, so you can use what you have.
- Budget-friendly Potatoes and pantry staples keep costs down while serving a crowd.
- Meal-prep friendly Great for leftovers, potlucks, and busy weeknights.
- Kid-approved Familiar flavors and creamy texture make it an easy win.
Common Mistakes to Avoid
- Skipping the roast Boiled potatoes can turn mushy. Roasting builds flavor and keeps texture intact.
- Overcrowding the pan Potatoes won’t brown if piled up. Use a large baking sheet for even roasting.
- Under-seasoning Potatoes need salt. Taste the creamy base and adjust before baking.
- Adding watery veggies raw Vegetables like mushrooms or zucchini release liquid. Sauté or roast them first.
- Overbaking Too long in the oven can dry out the casserole. Pull it when it’s bubbling and the top is golden.
Alternatives
- Vegan version Use vegan sour cream, plant milk, and dairy-free cheddar. Swap butter for olive oil in the topping. Add a sprinkle of nutritional yeast for extra cheesy flavor.
- Healthier twist Replace sour cream with Greek yogurt, use part-skim cheese, and add more broccoli or spinach.
- Spicy option Mix in diced pickled jalapeños, a pinch of chili flakes, or pepper jack cheese.
- Different cheeses Try a mix of gouda and cheddar, or use smoked cheddar for a bacon-like depth without the meat.
- Sweet potato swap Use cubed sweet potatoes for a slightly sweeter, nutrient-dense take. Adjust roasting time as needed.
This vegetarian loaded baked potato casserole brings classic baked potato flavors into an easy, shareable dish. It’s flexible, comforting, and simple enough for a busy weeknight, yet special enough for a casual gathering. Customize the veggies, play with cheeses, and make it your own.
Keep this one in your rotation—it’s a reliable, cozy favorite that always hits the spot.
Love this recipe? Check out our full collection of vegetarian and vegan recipes for more delicious ideas! And if you’re looking to share your creations (or get inspired by someone else’s), join our closed Facebook Group, The Peas and Carrots Society, a group of non-judgy folks who welcome all! Nothing but good food, good friends, and good fun!
Fully Loaded Baked Potato Casserole
Ingredients
- 3 pounds russet or Yukon Gold potatoes scrubbed and cut into 1-inch cubes
- 2 tablespoons olive oil
- 1 teaspoon kosher salt plus more to taste
- 1/2 teaspoon black pepper
- 1 teaspoon garlic powder
- 1 teaspoon smoked paprika or sweet paprika
- 1 cup sour cream or plain Greek yogurt; use plant-based to make it vegan
- 1/2 cup whole milk or 2% milk or plant milk
- 3 cups shredded sharp cheddar cheese divided (use vegan cheese if desired)
- 1 cup shredded mozzarella or Monterey Jack regular or vegan
- 4 green onions thinly sliced, divided
- 1 red bell pepper diced
- 1 cup cooked broccoli florets chopped small (fresh or thawed frozen)
- 1/2 cup canned corn drained (optional)
- 2 tablespoons unsalted butter melted (or vegan butter)
- 1 cup panko or regular breadcrumbs
- 1 teaspoon dried parsley or Italian seasoning
- Optional garnish: extra sour cream, hot sauce, chives
Instructions
- Preheat the oven to 425°F (220°C). Line a large baking sheet with parchment paper. Lightly grease a 9×13-inch casserole dish and set aside.
- In a large bowl, toss the potato cubes with olive oil, 1 teaspoon salt, black pepper, garlic powder, and smoked paprika. Spread them in a single layer on the baking sheet.
- Roast the potatoes for 25–30 minutes, flipping once halfway through, until they are tender and golden brown at the edges.
- While the potatoes are roasting, sauté the red bell pepper in a small skillet with a splash of olive oil and a pinch of salt for 3–4 minutes, just until slightly softened.
- Steam or microwave the broccoli until crisp-tender. Set aside both vegetables.
- In a large bowl, whisk together the sour cream and milk until smooth. Stir in 2 cups of the cheddar cheese, all of the mozzarella, and half the sliced green onions. Taste and adjust seasoning if needed.
- Add the roasted potatoes, bell pepper, broccoli, and corn (if using) to the bowl. Fold gently to coat without breaking up the potatoes too much.
- Transfer the mixture to the prepared casserole dish. Sprinkle the remaining 1 cup of cheddar cheese over the top.
- In a small bowl, stir together the melted butter, breadcrumbs, and dried parsley or Italian seasoning. Sprinkle this mixture evenly over the cheese layer.
- Reduce oven temperature to 375°F (190°C). Bake for 20–25 minutes, until the cheese is melted and the topping is golden and crisp.
- Let the casserole rest for 10 minutes before serving. Garnish with the remaining green onions. Add sour cream, hot sauce, or chives if desired.
FAQ
Can I use leftover baked potatoes?
Yes. Cube them and warm slightly before mixing so they don’t cool down the sauce too much. You may need a splash of milk to loosen the mixture.
What’s the best potato for this casserole?
Russets get fluffy and soak up flavor well, while Yukon Golds hold their shape and have a buttery texture. Either works, so choose based on your preference.
How do I make it gluten-free?
Use certified gluten-free breadcrumbs or skip the topping and add extra cheese. Everything else in the recipe is naturally gluten-free.
Can I add protein?
Absolutely. For a vegetarian option, stir in cooked lentils, chickpeas, or crumbled vegetarian sausage. Keep the amounts moderate so the casserole doesn’t become dense.
Why is my casserole watery?
Likely from high-moisture vegetables that weren’t pre-cooked. Sauté or roast watery veggies first, and avoid covering the dish while baking so steam can escape.
Can I assemble and freeze it unbaked?
Yes. Assemble without the breadcrumb topping, wrap well, and freeze. Thaw overnight, add the topping, and bake until hot and bubbling.
What can I serve with it?
A crisp green salad, roasted green beans, or a simple tomato-cucumber salad balances the richness. It also pairs well with a tangy slaw.
