Vegan Brussels Sprouts Casserole Recipe

This Vegan Brussels Sprouts Casserole is all about bringing a little cozy comfort to your table without the fuss. With roasted Brussels sprouts in a creamy, plant-based sauce and a crispy topping, it’s the kind of dish that makes everyone grab seconds. Whether it’s a weeknight or a special occasion, you can count on this casserole to add a hearty, crowd-pleasing touch that’s easy to make and packed with flavor.

A baked Brussels sprout casserole with a creamy sauce, topped with crispy onions and chopped herbs, in an oval dish with a spoon. A green cloth is partially visible in the background. — Brussel Sprout Casserole. Photo Credit: Two City Vegans

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This vegan casserole has become one of my go-to’s for a few reasons. It’s quick to make (under 30 minutes!) and has just the right mix of creamy and crispy that everyone at the table loves. It’s one of those sides that just feels right at any gathering, from holiday dinners to laid-back Sunday meals. For me, it’s all about how easy it is to bring a little extra warmth and flavor to any occasion.

Ingredients You’ll Need

You’ll need all the ingredients shown in the photograph below.

Bowl of halved Brussels sprouts surrounded by ingredients: vegetable milk, all-purpose flour, vegan butter, garlic powder, olive oil, pepper, fried onions, and chopped onions. — Brussel Sprout Casserole Ingredients. Photo Credit: Two City Vegans

How to Make Vegan Brussels Sprouts Casserole with Step-By-Step Instructions

Scroll down for the full recipe card containing a full printable recipe and measurements in both US customary and metric units.

Making this Vegan Brussels Sprouts Casserole is easy if you follow my simple instructions.

Prepare the Brussels Sprouts

Preheat your oven to 180ºC (350°F).

Trim the Brussels sprouts and slice them in half before placing them in a casserole dish. Drizzle with olive oil, season with salt and pepper, and toss everything together to coat.

A white oval dish filled with fresh Brussels sprouts seasoned with pepper, on a light speckled countertop. — Place the trimmed and cut Brussels sprouts in a greased casserole dish.

Roasted Brussels sprouts in an oval dish on a wooden board, with a small bowl of crispy toppings and fresh parsley nearby. — Bake for 20 minutes.

Pop them in the oven for about 20 minutes so they get tender and lightly browned.

Make the Sauce

While the Brussels sprouts are roasting, heat a small saucepan over medium. Melt the vegan butter, then add the finely chopped onions and garlic powder.

Butter slices melting in a black frying pan, with a white pepper mill and small bowl of chopped nuts nearby. — Melt the butter over medium heat.

A frying pan on a stove with chopped onions sautéing in melted butter, sprinkled with flour. — Add the onions, garlic powder, and flour.

Milk being poured into a skillet containing roux mixture, with a white pepper mill and bowl of fried onions nearby. — Pour in the milk and cook until the sauce thickens.

Sauté for 5-7 minutes until the onions are soft and fragrant. Stir in the flour, mixing to form a thick paste.

Slowly add the plant based milk, stirring constantly to avoid lumps, and continue stirring until the sauce thickens up nicely.

Casserole dish with baked Brussels sprouts in creamy sauce on wooden board, topped with cheese. Parsley and fried onions are nearby. — Combine the baked sprouts and the sauce, then bake for 10 minutes.

Assemble and Bake

Once the Brussels sprouts are ready, take them out of the oven and pour the sauce over the top, spreading it evenly. Slide the casserole back into the oven for another 10 minutes, letting the top get golden and bubbly.

Garnish and Serve

When it’s all done, top with fresh parsley and crispy fried onions. Serve warm and enjoy!

A baked dish of Brussels sprouts and bacon, garnished with parsley in an oval casserole dish, placed on a wooden board. Two spoons and a green napkin are beside the dish. — Garnish with parsley and top with crispy fried onions before serving.

Recipe Notes and Expert Tips

Here are a few of my top tips to make this vegan casserole just right.

Best Brussels: Cutting each Brussels sprout in half helps them cook more evenly and caramelize, bringing out their natural sweetness. This simple step makes a big difference in flavor.
Avoid Lumps in the Sauce: To get a creamy, lump-free sauce, pour in the plant based milk slowly and keep stirring constantly. This helps the sauce thicken smoothly and ensures even cooking.
Top It Off: For a richer finish, sprinkle some vegan cheese over the casserole before the final bake. It melts into the sauce, adding a creamy, slightly tangy layer.
Butter Swaps: Coconut oil works well if you don’t have vegan butter on hand or prefer a hint of coconut flavor. Just swap in the same amount, and you’re all set.
Boost the Flavor: Try adding a pinch of nutmeg or smoked paprika to the sauce for extra warmth and depth. Nutmeg adds a cozy touch, while smoked paprika brings a hint of earthy flavor.
Crispy Topping: For an extra-crispy finish, broil the casserole for 2-3 minutes after baking. This gives the top a nice golden color and a bit of crunch, especially with the fried onions!
Make-Ahead Friendly: You can assemble the casserole up to the baking step, cover it tightly, and refrigerate it for up to a day. Just bake it when you’re ready to serve.

A plate of creamy Brussels sprouts garnished with crispy onions and parsley, with a wooden board and additional bowl of onions in the background. — Brussel Sprout Casserole. Photo Credit: Two City Vegans

How to Store Leftover Brussels Sprouts Casserole

If you have leftovers, store them in an airtight container in the refrigerator, where they’ll stay fresh for up to 3 days. When reheating, warm them in the oven to keep the texture nice and crispy, or use the microwave if you’re in a hurry.

Note that this casserole isn’t ideal for freezing, as the creamy sauce may separate and affect the texture upon thawing.

What to Serve With Vegan Brussels Sprouts Casserole

This Vegan Brussels Sprouts Casserole pairs wonderfully with other holiday or comforting dishes. Try serving it alongside roasted potatoes, stuffing, or a crisp, refreshing salad to balance the creamy richness.

For a full meal, pair it with hearty mains like vegan nut roast or stuffed acorn squash. Crusty bread or dinner rolls also make a great addition, perfect for scooping up any extra sauce!

A baked casserole dish filled with creamy Brussels sprouts, garnished with chopped herbs and crispy toppings, with a serving spoon on the side. — Brussel Sprout Casserole. Photo Credit: Two City Vegans

More Easy Vegan Casserole Recipes for You to Try at Home

I’ve got even more easy, crowd-pleasing vegan casserole recipes that you’ll love!

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