Oven-roasted Brussels Sprouts are incredibly easy to make and are packed with great flavor.

It takes five ingredients and 25 minutes, and you bite into the crispiest and most flavorful Brussels Sprouts you have ever tasted.

Crispy and golden on the outside and tender on the inside. Mixed with mayonnaise and old-style grain mustard, you will beg for more.

Oven Roasted Brussels Sprouts with Mustard

Irresistible caramel flavor, which is sweet and nutty all in one bite. Once the mayonnaise comes in contact with the oven-roasted Brussels sprouts, it melts and releases a tremendously smooth sweet flavor.

The flavor combined with the old-style grain mustard, which is more tangy and spicy, is heavenly for your taste buds.

I was not raised eating Brussels sprouts, but once I took my first bite, there was no way back. I am in love with them and obsessed. Thus, I have shared many recipes with Brussels spouts with all of you.

Raw, steamed, roasted, sauteed, here we have a vegetable that can transform itself according to how you prepare it and is always a delicious side dish,

Roasted Brussels sprouts do not need much seasoning to taste fantastic, but I have come up with many ways to serve them over the years.

In this Article

How healthy are  Brussels sprouts for you?

Brussels sprouts are high in antioxidants, vitamins, and minerals, as well as high in fiber.

The perfect vegetable to add to your diet.

Oven Roasted Brussels Sprouts with Mustard

How do you know when Brussels sprouts are ripe?

The season for Brussels sprouts on the Northern Hemisphere is from October and lasts through March. Of course, with the hot houses, our grocery stores always offer them.

They should be firm and a bright green color. You want them free of buds that start turning yellow and begin to open.

Once you see the leaves turn yellow, brown, or wilted and smell like cabbage, they are too old and should not be eaten.

What is Old-Style Mustard?

Mustard seeds are blended with vinegar and white wine into a rich, fruity-scented paste.

The old-style mustard is milder than your regular mustard.

Do not substitute with regular mustard with this recipe, as it will not be the same flavor.

Here are a few helpful tips for the ingredients needed to make these delicious oven-roasted Brussels sprouts

This is a quick introduction. Please read the recipe for complete instructions.

Brussels Sprouts: Ensure they are all the same size for even roasting. Check that the nubby end is clear and not dark-spotted. The other leaves are tightly close to each other.

Olive oil: A light olive oil will not interfere with the flavor of the Brussels sprouts. Bertolli has been my cooking life-long favorite.

Old Style grain mustard: Classic Dijon mustard is characterized by its grainy texture.

Mayonnaise: if you can make homemade it, it is the best. However, Kraft makes a pretty good one, and it is easily accessible worldwide.

Parsley: Optional but adds a nice layer of flavor to this dish.

Oven Roasted Brussels Sprouts with Mustard

Equipment needed

I only recommend what I use and love.

Cutting board: I always use wood as they are gentle on my knife blades.

Chef’s knife: a must in every kitchen. The sprouts are a bit tough to cut thru, and a sharp knife will facilitate the slicing.

Mixing bowl and spatula:  Used twice with this recipe. Once to prepare the Brussels sprouts before roasting, and the second time to prepare the sauce and mix them soon after coming out of the oven.

Baking sheet: use a large one so your sprouts will have room to be spread out.

Serving dish: A lovely dish is always welcome to the table.

Oven Roasted Brussels Sprouts with Mustard

Roasting tips to consistently achieve excellent oven-roasted Brussels sprouts.

A few tips and tricks will ensure your roasted Brussels sprouts turn out perfectly every time.

Start by choosing your Brussels bright green sprouts with the outer leaves intact and tight to each other. Firm when you gently squeeze them. Having them all the same size is beneficial for even roasting.

Trim the nubby ends and slice in half from the flat base through the top. You want that flat edge that will bake flush to the pan and caramelize.

Do not remove the core. It holds your leaves together, and during the roasting process, it will soften out and give you a great flavor.

Do not overcrowd the baking sheet, or they will produce steam when they roast and will never crisp up to your liking. If making them for a crowd, use two baking sheets. You will thank me for it later.

Bake at a high temperature to get crispy with golden edges, but not too high that the olive oil burns the baking sheet and creates that unpleasant bitter flavor.

But most importantly, do not disturb them when they are roasting.

Halved Brussels sprouts, when placed flat side down against the pan, will steam the inside, making them perfectly golden and crispy on the outside and perfectly tender on the inside.

Oven Roasted Brussels Sprouts with Mustard

And step-by-step to make these delicious roasted Brussels sprouts with mustard.

This recipe is very quickly achieved.

  • Wash the Brussels sprouts, dry them, slice them lengthwise, and place them in a bowl.
  • Add olive oil to them and ensure that each piece is nicely covered.
  • Transfer the Brussels sprouts to a large baking sheet and turn with all cut flat side facing the baking sheet.
  • In the oven, they go.
Oven Roasted Brussels Sprouts with Mustard

Meanwhile, prepare the sauce by whisking together the mayonnaise and the old-style grain mustard.

  • Once the Brussels sprouts are golden and ready, remove them from the oven and add them to the prepared mayo-mustard sauce.
  • Season with salt and pepper, mix well.
  • Transfer to a serving dish, sprinkle the finely chopped parsley, and enjoy.

What can you serve with your oven-roasted Brussels sprouts recipe?

The possibilities are endless as they are the perfect side dish to most food.

Grilled salmon with olives and pine nuts

Chilean sea bass with tomato relish

Stuffed tomatoes

Roasted chicken

Chicken and potatoes tortilla

They are also the perfect party side dish.

Oven Roasted Brussels Sprouts with Mustard

Can the Brussels sprouts be made ahead of time?

They can be prepared to the point of being mixed with olive oil and then set aside. Once the Brussels sprouts are cut, they must be seasoned with oil, or they will turn to a dull brownish color.

However, since this dish is served warmly, I will not recommend preparing it early and warming it up at the last minute.

Equipment needed to make this oven roasted Brussels sprouts

Oven Roasted Brussels Sprouts

5 from 4 votes
Oven Roasted Brussels Sprouts with Mustard
Prep Time: 5 minutes
Cook Time: 20 minutes
Total Time: 25 minutes
Servings: 4
Oven-roasted Brussels Sprouts are incredibly easy to make and are packed with great flavor. Crispy on the outside and tender on the inside.


  • 3 cups brussels sprouts, washed and halved lengthwise, core left intact.
  • ¼ cup olive oil
  • 3 tablespoons Old style grain mustard
  • 3 tablespoons mayonnaise
  • 2 tablespoons parsley, chopped parsley ( less if you wish)
  • salt and pepper


  • Preheat the oven to 400F.
  • In a large bowl place, the sliced Brussels sprouts and drizzle them with olive oil. Mix well and transfer them, cut side down on a cookie sheet.
  • Bake in the preheated oven for 20 minutes. They need to be brown and soft.
  • Meanwhile, whisk together mustard and mayonnaise. When the sprouts are done, mix them with the mustard mayo mixture.
  • Season with salt and pepper and add the parsley. Give it a last toss and serve.


Do not overcrowd the baking sheet, or they will produce steam when they roast and will never crisp up to your liking.
If making them for a crowd, use two baking sheets. You will thank me for it later.


Calories: 227kcal | Carbohydrates: 7g | Protein: 3g | Fat: 22g | Saturated Fat: 3g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 12g | Trans Fat: 0.02g | Cholesterol: 4mg | Sodium: 208mg | Potassium: 287mg | Fiber: 3g | Sugar: 2g | Vitamin A: 681IU | Vitamin C: 59mg | Calcium: 39mg | Iron: 1mg

Giangi’s Kitchen provides nutritional information, but these figures should be considered estimates, as a registered dietician does not calculate them.

Did you make this?

Leave a comment below and tag @giangiskitchen on Instagram

Visit my Amazon Storefront for my selection of favorite kitchen essentials. I only recommend equipment that I use and love.

Giangi's Kitchen Amazon Storefront

Please read my privacy policy for more info. I only recommend the products that I love and use. This site contains affiliate links to products. We may receive a commission for purchases made through these links.