If you’re looking for a comforting yet nourishing dish, you’re going to absolutely love this Healthy Broccoli Mushroom Casserole Recipe. It’s packed with fresh veggies, super easy to make, and has that satisfyingly crispy topping that makes casseroles so crave-worthy. I remember the first time I made this—it instantly became one of my weeknight go-tos, especially when I wanted something wholesome but still indulgent in texture. Stick with me, and I’ll share all my tips so you nail it every time.

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Why You’ll Love This Recipe

Wholesome Ingredients: Fresh broccoli and mushrooms give you all the fiber and nutrients without any heavy creams or cheeses.
Simple and Quick: You can have this casserole baked and ready in under an hour, perfect for busy days.
Deliciously Crispy Top: The toasted whole-wheat panko adds a golden crunch that everyone will shout about.
Versatile Comfort Food: It’s a veggie-packed dish that pairs beautifully with many meals or stands on its own.

A white oval dish filled with a baked broccoli and mushroom casserole, showing about three layers: the bottom layer is steamed broccoli with bright green stalks and dark green tops, the middle layer has cooked brown mushrooms with a soft texture, and the top layer is a golden-brown crispy breadcrumb topping that covers the vegetables unevenly. A silver spoon rests inside the dish, partially scooping up some broccoli and mushroom pieces. The dish sits on a round wooden board, and the background is a white marbled surface. Photo taken with an iphone --ar 2:3 --v 7 - Healthy Broccoli Mushroom Casserole, Broccoli Mushroom Bake, nutritious vegetable casserole, easy healthy dinner, vegan vegetable casserole

Ingredients You’ll Need

The magic here really happens with simple, fresh ingredients that play off each other so well—earthy mushrooms, tender broccoli, and a mild smoky note from paprika. When you shop, pick broccoli with firm stalks and vibrant green florets, and fresh mushrooms that are dry to the touch for the best flavor and texture.

Flat lay of cooked, diced turkey pieces, fluffy cooked white rice grains, a small white ceramic bowl of creamy condensed mushroom soup, a small white ceramic bowl filled with clear chicken broth, a small white ceramic bowl of thick mayonnaise, a small white ceramic bowl of smooth sour cream, a small white ceramic bowl containing finely diced white onion, a small white ceramic bowl with finely diced celery stalks, a small white ceramic bowl of pale slivered almonds, two whole uncracked brown eggs, a small white ceramic bowl of coarsely crushed golden Ritz crackers, a small white ceramic bowl with melted yellow butter, a few sprigs of fresh green parsley, salt and black peppercorns scattered lightly for seasoning, all arranged symmetrically with balanced proportions on a clean white marble surface, soft natural light, photo taken with an iPhone, professional food photography style, fresh ingredients, white ceramic bowls, no bottles, no duplicates, no utensils, no packaging --ar 2:3 --v 7 --p m7354615311229779997 - Healthy Broccoli Mushroom Casserole, Broccoli Mushroom Bake, nutritious vegetable casserole, easy healthy dinner, vegan vegetable casserole

Broccoli Florets: Use fresh broccoli cut into bite-sized pieces; frozen can work but fresh is best for texture.
Olive Oil: This adds a nice fruity richness for sautéing without overpowering the veggies.
Garlic Cloves: Fresh garlic brings a sharp, aromatic punch that lifts the whole dish.
Yellow Onion: The mild sweetness of a yellow onion balances the earthiness of mushrooms.
Button Mushrooms: These add umami depth; slice or quarter depending on preference.
Smoked Paprika: This spice is a game changer—it adds warmth and a subtle smoky flavor without heat.
Low-fat Milk (or any milk of choice): Creates a creamy base without being heavy—non-dairy milk works great too.
Cornstarch: Helps thicken the milk sauce beautifully, giving it a luxurious texture.
Sea Salt and Pepper: Essential for seasoning; adjust to your taste.
Whole-Wheat Panko Breadcrumbs: Toasted till golden for that irresistible crunchy topping; gluten-free options work just as well.

Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Variations

I love tweaking this Healthy Broccoli Mushroom Casserole Recipe based on what I have on hand or the season. Feel free to experiment—after all, cooking should be fun and fit your taste buds.

Add Cheese: I sometimes sprinkle a little grated Parmesan or sharp cheddar on top for extra richness when I’m not keeping it dairy-free—it’s addictive!
Switch up the Mushrooms: Experiment with cremini or shiitake mushrooms for a deeper umami flavor.
Use Different Toppings: Try crushed nuts or seeds instead of panko for a nuttier crunch and a gluten-free twist.
Spice It Up: Adding a pinch of cayenne or chili flakes wakes up the flavors beautifully if you like a bit of heat.

How to Make Healthy Broccoli Mushroom Casserole Recipe

Step 1: Prep and Steam the Broccoli

First things first, let’s get that broccoli tender but still with a nice bite—not mushy! Use a steaming basket over boiling water and cover it while it steams. I usually check after about 5 minutes; the florets should be bright green and fork-tender. Overcooking here leads to a soggy casserole, so keep an eye on it.

Step 2: Sauté the Aromatics and Mushrooms

While the broccoli steams, heat your olive oil over medium heat. Toss in the diced onion and cook until translucent—I find this takes about 3-4 minutes. Then stir in minced garlic, mushrooms, and smoked paprika. Cook everything together for another 5-6 minutes until the mushrooms soften and release their juices. Stir occasionally so nothing sticks or burns.

Step 3: Make the Creamy Sauce

In a small pot, whisk together your milk, cornstarch, salt, and pepper over medium heat. This is the cozy binder that holds the casserole together, so be patient—it takes around 2-3 minutes to thicken to a silky consistency. Once it coats the back of a spoon, you’re good to go!

Step 4: Assemble and Bake

Transfer your steamed broccoli to the prepared baking dish. Pour the sautéed mushroom and onion mixture over it, then drizzle the thickened milk sauce evenly on top. Now for the fun part—toast your panko breadcrumbs in the same pan with a little spray of oil until golden and crisp. That toasty topping makes all the difference, so don’t skip it! Sprinkle them generously on the casserole, then pop it in a preheated 350°F oven for about 30 minutes. You want the top bubbly and golden brown.

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Pro Tips for Making Healthy Broccoli Mushroom Casserole Recipe

Perfect Broccoli Texture: Steam until just tender, or it will get mushy in the oven—crisp-tender works best.
Don’t Skip Toasting Panko: This step brings out so much flavor and crunch; raw breadcrumbs won’t crisp well in the casserole.
Use Smoked Paprika: It adds a subtle smoky note that deepens the flavor without heat—trust me, it’s a game changer.
Make It Milk-Friendly: For creamier texture, you can substitute the cornstarch and milk with a high-quality cream or yogurt, but watch baking time closely.

How to Serve Healthy Broccoli Mushroom Casserole Recipe

The image shows a white bowl filled with a baked broccoli and mushroom casserole. The dish has a crispy, golden brown breadcrumb topping scattered unevenly across the surface. Underneath the topping are green broccoli florets mixed with browned mushrooms and soft cooked onions, creating a mix of green and brown colors. A metal spoon rests inside the bowl with roasted mushroom slices and broccoli on it. The bowl is set on a white marbled surface with a white cloth with red stripes partially visible underneath. photo taken with an iphone --ar 2:3 --v 7 - Healthy Broccoli Mushroom Casserole, Broccoli Mushroom Bake, nutritious vegetable casserole, easy healthy dinner, vegan vegetable casserole

Garnishes

I like keeping it simple here—freshly chopped parsley or chives sprinkled on top brighten the casserole and add a fresh pop of color. Sometimes a squeeze of lemon juice right before serving makes the flavors sing, especially if the paprika feels a bit heavy.

Side Dishes

This casserole works beautifully alongside roast chicken, baked tofu, or even a grain like quinoa or brown rice. For a lighter meal, a crisp green salad with vinaigrette is a refreshing partner that balances the creamy casserole.

Creative Ways to Present

For gatherings, I’ve served this in individual ramekins topped with extra panko and fresh herbs—it feels fancy but is so easy to do. You can also layer it in a trifle-style dish with additional sautéed mushrooms and a sprinkle of toasted nuts on top for extra texture play.

Make Ahead and Storage

Storing Leftovers

I usually let leftovers cool completely, then cover tightly and store in the fridge for up to 3 days. Reheating works best in the oven or toaster oven to help keep that breadcrumb topping crisp—microwaving can make it a bit soggy.

Freezing

This casserole freezes surprisingly well! I portion it into airtight containers and freeze for up to 2 months. Thaw overnight in the fridge before reheating in the oven to avoid a soggy texture.

Reheating

To bring leftovers back to life, I warm them in a 350°F oven for about 15-20 minutes, uncovered, to achieve a nice crispy top again. If you only have a microwave, heat in short intervals and finish with a quick toast under the broiler if you can.

FAQs

Can I make this Healthy Broccoli Mushroom Casserole Recipe vegan?

Absolutely! Use a plant-based milk like almond or oat milk, and swap the panko breadcrumbs for a certified vegan brand. Since this recipe doesn’t use cheese or dairy beyond milk, it’s easy to keep vegan-friendly.
Can I use frozen broccoli instead of fresh for this casserole?

You can, though I recommend thawing and draining frozen broccoli well before assembling to reduce extra moisture, which can make the casserole watery. Fresh broccoli tends to yield the best texture.
Is this casserole low in calories?

Yes! This Healthy Broccoli Mushroom Casserole Recipe clocks in at around 185 calories per serving, making it a great option for a light but filling meal.
Can I prepare this casserole ahead of time?

Definitely! You can assemble the casserole a day before baking—just cover and refrigerate. When ready, add the toasted panko topping and bake as instructed. This makes meal prep a breeze.

Final Thoughts

This Healthy Broccoli Mushroom Casserole Recipe holds such a special place in my kitchen because it blends simplicity with satisfying flavors without any fuss. It’s one of those dishes that makes you feel good about what you’re eating but still feels indulgent with its crispy topping. I truly hope you give this recipe a try and that it becomes a staple in your meal rotation like it did in mine—there’s nothing like sharing a warm casserole with loved ones to make everyday moments cozy and special.