Vegetable Casserole
A warm, comforting medley of tender vegetables baked in a creamy, savory sauce beneath a golden, bubbly crust. This all-American one-dish wonder brings broccoli, carrots, and bell peppers together with a rich homemade white sauce and a crispy breadcrumb topping. Perfect for weeknight dinners or potluck gatherings, it turns simple garden vegetables into a hearty, satisfying meal.
For 4 servings
- prep
Preheat the oven and prep the vegetables.
1.Preheat oven to 375°F (190°C).2.Cut broccoli into florets and slice carrots into thin rounds.3.Dice the bell pepper and onion, and mince the garlic. - boil · ~2 min
Blanch the broccoli and carrots.
1.Bring a large pot of water to a rolling boil. Add 1 teaspoon salt to the water.2.Add broccoli and carrot slices, boil for 2 minutes until slightly tender but still crisp.3.Drain immediately in a colander and rinse under cold water to stop cooking. Set aside. - saute · ~6 min
Sauté the aromatics and bell pepper.
1.Melt 1 tablespoon butter in a skillet over medium heat.2.Add diced onion and cook until softened, about 3-4 minutes.3.Add diced bell pepper and minced garlic, cook for another 2 minutes. Remove from heat. - saute · ~5 min
Make the creamy white sauce.
1.In a medium saucepan over medium heat, melt the remaining 1 tablespoon butter.2.Whisk in the all-purpose flour and cook, stirring constantly, for 1 minute until lightly golden.3.Slowly pour in the milk while whisking vigorously to prevent lumps.4.Add salt, black pepper, and nutmeg. Continue whisking until the sauce thickens, about 3-4 minutes.TIPConstant whisking prevents lumps in the sauce. Pour the milk in a slow, steady stream. - mix
Combine the filling.
1.In a large bowl, toss together the blanched broccoli, carrots, and the sautéed onion-pepper mix.2.Pour the white sauce over the vegetables and stir gently to coat everything evenly.3.Fold in half of the shredded cheddar cheese. - assemble
Assemble the casserole for baking.
1.Transfer the vegetable mixture into a greased baking dish, spreading it evenly.2.Sprinkle the remaining cheddar cheese over the top.3.In a small bowl, mix breadcrumbs with olive oil until slightly moist, then scatter evenly over the cheese layer. - bake · ~25 min
Bake until golden and bubbly.
Place the baking dish in the preheated oven and bake for 20-25 minutes, until the top is golden brown and the edges are bubbling.
TIPIf the top browns too quickly, tent loosely with foil for the final 10 minutes. - rest · ~10 min
Let the casserole rest before serving.
Remove from the oven and let the casserole stand for 5-10 minutes. This allows the sauce to set slightly, making it easier to serve.
TIPResting helps the casserole slice cleanly instead of running across the plate.
What to keep in mind.
6 tips from the recipe — small details that make a real difference to the final dish.
- 1Blanch the broccoli and carrots for exactly 2 minutes to keep them crisp-tender after baking.
- 2Grate your own cheddar from a block—it melts more smoothly than pre-shredded cheese.
- 3Whisk the milk into the flour-butter roux in a slow, steady stream to avoid lumps in the sauce.
- 4Let the casserole rest 5–10 minutes after baking so the sauce sets and slices cleanly.
- 5If the breadcrumb top browns too fast, tent the dish loosely with foil for the last 10 minutes.
- 6Use freshly grated nutmeg for a warm, aromatic note that elevates the white sauce.
Adapt it for your goals.
Extra-cheesy
Add 1/4 cup grated Parmesan to the breadcrumb topping and swap half the cheddar for Gruyère for a richer, nuttier flavor.
high proteinHigh-protein
Stir in 1 cup of cooked, diced chicken or chickpeas to the vegetable mixture for a more substantial main dish.
low oilLow-oil
Replace the butter in the roux with a neutral oil and use skim milk; skip the olive oil on breadcrumbs and toast them dry in a pan.
gluten freeGluten-free
Use a gluten-free all-purpose flour blend for the roux and gluten-free breadcrumbs to make the dish celiac-friendly.
Why this is on our healthy list.
Rich in Vitamin A
Carrots and broccoli provide beta-carotene, which the body converts into vitamin A for healthy vision and immune function.
Good Source of Fiber
Broccoli, carrots, and bell peppers contribute dietary fiber, supporting healthy digestion and satiety.
Calcium from Dairy
The milk and cheddar cheese offer calcium, essential for strong bones and teeth.
Low in Added Sugar
This casserole relies on savory flavors with no added sugar, making it a balanced side or main dish.
Frequently asked questions
Yes, but thaw and pat them dry first to remove excess moisture, then skip the blanching step to avoid mushiness.



