Whether you need an easy weeknight side or a comforting casserole for a holiday or potluck, this Cheesy Vegetable Casserole is a simple, crowd-pleasing option. Made with frozen mixed vegetables, a creamy condensed-cheddar-based sauce, and a crisp topping, it’s quick to assemble and perfect for getting picky eaters to enjoy their veggies.
Casseroles were a fixture at family dinners and potlucks for generations. This recipe channels that classic comfort food vibe without requiring a long ingredient list or complicated technique. You’ll find it comforting, cheesy, and easy to adapt to whatever vegetables or cheeses you have on hand.
Reasons to Love This Recipe:
- A rich, creamy, cheesy side that works for both weeknights and holiday tables.
- Uses just a few pantry staples—no sour cream or cream cheese required.
- Great for sneaking vegetables to kids: the sauce and melted cheese make veggies more appealing.
- Comforting textures: tender vegetables, velvety sauce, and a crunchy topping.
Ingredients
- Frozen vegetables: About 24 ounces (1½ pounds) of a mixed medley such as cauliflower, broccoli, and carrots. Use whatever frozen blend you prefer.
- Condensed cheddar cheese soup: A 10.5-ounce can forms the base of the sauce. If you prefer, substitute cream of mushroom, cream of chicken, or a homemade cheese sauce.
- Milk: About 1/4 cup to thin the condensed soup and create a smooth sauce.
- Shredded cheddar cheese: 2 cups, divided. Freshly shredded sharp cheddar melts best.
- Seasonings: Garlic powder, onion powder, and a pinch of ground black pepper.
- Crispy fried onions: Approximately 4 ounces for a crunchy topping—optional but recommended.
How to Make Cheesy Vegetable Casserole
Start by briefly cooking the frozen vegetables so they’re hot and tender but not overcooked.
- Bring a large pot of salted water to a boil and add the frozen vegetables.
- Boil 2–3 minutes until warmed through, then drain well in a colander and set aside.
Preparing the Sauce
Step one: In a large bowl, whisk together the condensed cheddar soup, milk, garlic powder, onion powder, and black pepper until smooth.
Step two: Stir in 1½ cups of the shredded cheddar cheese until just combined.
Step three: Fold the drained vegetables into the cheese sauce so they are evenly coated.
Step four: Spread the vegetable mixture in a greased 9 x 13-inch baking dish.
Step five: Sprinkle the remaining ½ cup of shredded cheddar over the top.
Step six: Bake in a preheated oven at 350°F for 20–25 minutes, until the casserole is hot and bubbly.
Topping the Casserole
Step seven: Remove the casserole from the oven and evenly sprinkle about 4 ounces of crispy fried onions on top.
Step eight: Return to the oven for 5 more minutes to crisp the topping. If you prefer, broil 1–2 minutes at the end—watch closely so the onions don’t burn.
Serving
Let the casserole rest about 5 minutes after removing from the oven so it firms up slightly, then serve warm.
Pairs Well With:
- Ham, roasted or sliced
- Chicken
- Turkey
- Green bean casserole
- Mashed or roasted potatoes
- White or brown rice
- Sweet potatoes or scalloped potatoes
- Other casseroles for a potluck or covered-dish dinner
Storing & Leftovers
Allow leftovers to cool to room temperature, cover tightly with plastic wrap or foil, and refrigerate for up to 4 days. Reheat individual portions in the microwave in 30-second intervals until warmed through.
Freezing
The baked casserole is best eaten fresh, but you can freeze the unbaked assembled dish. Combine the sauce and frozen vegetables (no need to precook if using frozen), spread into a freezer-safe baking dish, cover tightly with foil, and freeze up to 3 months.
To bake from frozen: Thaw overnight in the refrigerator, then bake 30–45 minutes at 350°F until heated through. Add the crispy topping and bake an additional 5 minutes to crisp.
Substitutions
Fresh vegetables: Substitute about 1½ pounds of fresh, cut vegetables. Steam or blanch them briefly until bright and tender before using.
Without condensed soup: Replace the cheddar condensed soup with 1¼ cups of cooled homemade cheese sauce or another creamy substitute.
Other vegetables: Swap the California medley for green beans, cauliflower, bell peppers, corn, Brussels sprouts, or any frozen mix you like. Add water chestnuts for extra crunch if desired.
Variations
Alternate toppings: Try crushed crackers, potato chips, buttered cornflakes, or toasted breadcrumbs instead of fried onions for a different crunch.
Alternate cheeses: Cheddar is classic, but you can blend in mozzarella for stretch, parmesan for sharpness, or try Gruyère for a more refined flavor.
Cauliflower casserole: Use only cauliflower florets with cheddar or a similar cheese for a simple single-vegetable bake.
Veggie and rice casserole: Stir in 2 cups cooked rice and increase the sauce and cheese for a heartier, more filling dish.
More Family Favorite Side Dishes
- Funeral potatoes with a crunchy cornflake topping
- Parmesan-crusted potatoes
- Pizza-inspired salad
- Slow-cooker maple brown sugar glazed carrots
- Roasted asparagus and carrots
If you try this Cheesy Vegetable Casserole, enjoy the ease and nostalgia—and feel free to adapt it to your family’s tastes.
Recipe at a Glance
- Prep time: 10 minutes
- Cook time: 25 minutes
- Total time: 35 minutes
- Servings: 8
- Calories (approx.): 294 kcal per serving
- Author: Dorothy Bigelow
Recipe Ingredients (summary)
- 24 oz frozen California medley vegetables (or preferred mix)
- 10.5 oz can condensed cheddar cheese soup (or substitute)
- 1/4 cup milk
- 1/2 tsp garlic powder
- 1/2 tsp onion powder
- 1/4 tsp ground black pepper
- 2 cups shredded cheddar cheese, divided
- 4 oz crispy fried onions (optional)
Step-by-Step Instructions (summary)
- Preheat oven to 350°F and grease a 9 x 13-inch baking dish.
- Boil frozen vegetables 2–3 minutes, drain thoroughly.
- Mix condensed soup, milk, and seasonings in a bowl.
- Stir in 1½ cups shredded cheese, then fold in drained vegetables.
- Transfer mixture to baking dish, top with remaining ½ cup cheese.
- Bake 20–25 minutes until bubbly. Top with fried onions and bake 5 more minutes or broil briefly to brown.
- Let cool 5 minutes before serving.
Nutrition values are approximate and will vary based on specific ingredients and portion sizes.