Keto Garlic Parmesan Roasted Brussels Sprouts
These Keto Garlic Parmesan Roasted Brussels Sprouts are one of those side dishes that can turn a simple dinner into something that feels a little more special.
The Brussels sprouts roast until the edges become deeply browned and crisp, while the centers stay tender. Garlic, olive oil, butter, Parmesan, and black pepper add plenty of savory flavor without making the recipe complicated.
They work just as well next to chicken on a weeknight as they do beside prime rib or ham for a holiday dinner.
And because the ingredients are simple, this is an easy vegetable side dish to keep in rotation whenever you want something low carb that doesn’t feel boring.
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Why You’ll Love These Keto Brussels Sprouts
Brussels sprouts become completely different once they’re roasted at high heat.
Instead of being soft or bitter, they develop caramelized edges and a slightly nutty flavor that works especially well with Parmesan and garlic.
You’ll love this recipe because it’s:
- Low carb
- Naturally gluten-free when individual ingredients are gluten-free
- Easy to prepare
- Crispy on the outside
- Tender inside
- Ready in about 35 minutes
- Made with simple ingredients
- Great for holiday dinners
- Easy enough for weeknights
- Delicious with chicken, steak, ham, or roast beef
A sturdy rimmed sheet pan makes a noticeable difference because the Brussels sprouts need room to roast instead of steam.
Ingredients You’ll Need
Brussels Sprouts
Use fresh Brussels sprouts whenever possible.
Look for sprouts that are firm, bright green, and tightly closed. Smaller sprouts tend to cook a little faster, while larger ones may need to be quartered instead of halved.
Olive Oil
Olive oil helps the outer leaves crisp and brown in the oven.
Butter
A little melted butter adds richness and gives the Parmesan and garlic even more flavor.
Fresh Garlic
Fresh minced garlic gives this recipe a stronger, fresher flavor than garlic powder alone.
A garlic press makes this step especially quick.
Parmesan Cheese
Freshly grated Parmesan melts into the Brussels sprouts and creates those salty, crispy bits around the edges.
A microplane grater is useful for getting the Parmesan very fine so it sticks evenly.
Salt and Black Pepper
These simple seasonings help bring out the natural roasted flavor of the Brussels sprouts.
Optional Red Pepper Flakes
If you like a little heat, add a small pinch before roasting or sprinkle some on at the end.
Have You Stocked Up on Parmesan Cheese?
A good Parmesan is one of those ingredients that earns its place in a keto kitchen because it works in so many recipes.
For these Brussels sprouts, use finely grated Parmesan cheese rather than a thick shredded blend.
The finer texture coats the vegetables more evenly and creates little crispy Parmesan edges as everything roasts.
Look for a block of Parmesan or Parmigiano-Reggiano with a short ingredient list, then grate it fresh when you need it.
It’s also useful for chicken Parmesan, cauliflower mash, roasted broccoli, zucchini fries, soups, casseroles, and creamy sauces.
How to Make Keto Garlic Parmesan Brussels Sprouts
1. Prep the Brussels Sprouts
Preheat the oven to 425°F.
Trim the tough stem ends from the Brussels sprouts.
Remove any damaged or yellow outer leaves.
Cut the sprouts in half from top to bottom.
If you have especially large Brussels sprouts, cut them into quarters so they cook more evenly.
Pat them dry with a clean kitchen towel or paper towels.
Removing excess moisture helps them roast instead of steam.
2. Make the Garlic Parmesan Coating
In a large mixing bowl, combine:
- Olive oil
- Melted butter
- Minced garlic
- Parmesan
- Salt
- Black pepper
- Red pepper flakes, if using
Stir until combined.
Add the Brussels sprouts and toss thoroughly.
Make sure the cut surfaces and outer leaves get coated.
3. Arrange Them Cut-Side Down
Spread the Brussels sprouts over a large rimmed baking sheet in a single layer.
Place as many as possible cut-side down.
That flat surface is where some of the best browning happens.
Avoid crowding the pan.
If the sprouts are packed tightly together, the moisture they release gets trapped and they soften instead of crisping.
For a large batch, use two sheet pans rather than squeezing everything onto one.
4. Roast Until Crispy
Roast at 425°F for approximately 20 to 25 minutes.
Start checking around 18 to 20 minutes.
The Brussels sprouts are ready when:
- The cut sides are deeply browned
- The outer leaves are crisp
- The centers are tender when pierced with a fork
- The Parmesan has developed golden edges
For extra browning, you can broil them for 1 to 2 minutes at the end.
Watch carefully because Parmesan can brown very quickly under the broiler.
5. Finish With More Parmesan
Transfer the Brussels sprouts to a serving bowl or platter.
While they’re still hot, sprinkle with another tablespoon or two of Parmesan.
Add chopped parsley if you’d like a little freshness and color.
A small squeeze of lemon can also brighten the flavor, although it’s completely optional.
Serve immediately while the edges are still crisp.
What to Serve With Garlic Parmesan Brussels Sprouts
These Brussels sprouts pair well with almost any savory main dish.
For a holiday dinner, serve them alongside your Keto Garlic Herb Prime Rib. The buttery garlic flavors work especially well together.
They’re also an easy side for Keto Christmas Ham With Sugar-Free Glaze when you want a low carb holiday plate with something green and crispy.
For a weeknight meal, try them with Keto Air Fryer Chicken Parmesan.
You can also serve a smaller portion next to a bowl of Keto Loaded Cauliflower Soup for a cozy fall or winter dinner.
Or pair them with Crispy Air Fryer Keto Chicken Tenders for an easy family-friendly meal.
Tips for Extra Crispy Brussels Sprouts
Dry Them Well
Water is the enemy of browning.
If you rinse the Brussels sprouts, dry them thoroughly before adding oil and seasonings.
Don’t Crowd the Pan
This is probably the biggest difference between crispy and soft Brussels sprouts.
They need space for hot air to circulate.
Roast Them Cut-Side Down
Putting the flat cut surface directly against the hot sheet pan gives you better caramelization.
Use Freshly Grated Parmesan
Freshly grated Parmesan melts and browns better than many pre-shredded varieties.
Don’t Use Too Much Oil
You want enough oil to coat the sprouts but not so much that they’re sitting in it.
Too much oil can make them greasy instead of crisp.
Save Some Parmesan for the End
Adding a little fresh Parmesan after roasting gives you both crispy cooked cheese and fresh Parmesan flavor.
Can I Make These in the Air Fryer?
Yes.
Air fry the seasoned Brussels sprouts at 375°F to 380°F for approximately 12 to 16 minutes, shaking the basket a few times during cooking.
Cook in batches if necessary.
Crowding the basket will make it harder for them to crisp.
Air fryers vary, so begin checking a few minutes early.
Can I Use Frozen Brussels Sprouts?
Fresh Brussels sprouts will give you the best crispy texture.
Frozen Brussels sprouts contain more moisture, so they tend to roast softer.
If frozen is all you have, thaw them first and dry them as thoroughly as possible before seasoning.
You may also need a few extra minutes of roasting time.
Variations to Try
Bacon Parmesan Brussels Sprouts
Add cooked crumbled bacon after roasting.
Lemon Garlic Brussels Sprouts
Finish with fresh lemon zest and a small squeeze of lemon juice.
Spicy Parmesan Brussels Sprouts
Add extra red pepper flakes or a sprinkle of cayenne.
Extra Cheesy Brussels Sprouts
Add shredded mozzarella during the final 3 to 5 minutes of roasting.
Garlic Herb Version
Add chopped rosemary or thyme to the seasoning mixture.
How to Store Leftover Brussels Sprouts
Allow leftovers to cool before transferring them to an airtight container.
Refrigerate for up to 3 to 4 days.
The Brussels sprouts will soften in the refrigerator, but they still reheat well.
The Best Way to Reheat Them
For the best texture, reheat them in the oven or air fryer.
Air Fryer
Heat at 350°F for approximately 4 to 6 minutes.
Oven
Bake at 375°F for approximately 8 to 10 minutes.
Microwave
The microwave works when you’re in a hurry, but the Brussels sprouts won’t stay as crispy.
Frequently Asked Questions
Are Brussels sprouts keto-friendly?
Brussels sprouts can fit into a keto or low carb eating pattern when portion sizes are considered. They contain more carbohydrates than some leafy vegetables, but they also provide fiber and work well as a vegetable side dish.
Why aren’t my Brussels sprouts crispy?
The most common reasons are excess moisture, overcrowding the pan, or roasting at too low a temperature.
Dry the sprouts well, spread them in one layer, and roast at high heat.
Should I boil Brussels sprouts before roasting?
No.
Boiling adds moisture and isn’t necessary for this recipe.
Roasting them from raw helps create much better browning.
Should Brussels sprouts be cut in half?
Yes.
Halving them exposes a flat surface that can sit directly against the hot pan and develop a deeply browned crust.
Can I prepare them ahead of time?
You can trim and halve the Brussels sprouts up to a day ahead.
Store them covered in the refrigerator.
For the best texture, wait to add the oil, butter, garlic, and Parmesan until you’re ready to roast.
Can I leave out the Parmesan?
Yes.
They’ll still roast well with garlic, olive oil, butter, salt, and pepper.
The Parmesan adds extra flavor and crispness, but it isn’t required.
Keto Garlic Parmesan Roasted Brussels Sprouts
Ingredients
Method
- Preheat oven to 425°F.
- Trim the ends from the Brussels sprouts and remove any damaged outer leaves.
- Cut the Brussels sprouts in half. Quarter very large sprouts if needed.
- Pat the Brussels sprouts thoroughly dry.
- In a large bowl, combine olive oil, melted butter, minced garlic, ⅓ cup Parmesan, salt, black pepper, and optional red pepper flakes.
- Add the Brussels sprouts and toss until evenly coated.
- Arrange them in a single layer on a large rimmed baking sheet, placing as many as possible cut-side down.
- Roast for 20 to 25 minutes, or until the cut sides are deeply browned and the centers are tender.
- For extra crispness, broil for 1 to 2 minutes at the end, watching carefully.
- Remove from the oven.
- Sprinkle with the remaining Parmesan and optional parsley.
- Add lemon zest or a light squeeze of lemon juice if desired.
- Serve hot.
Notes
Approximate Nutrition Per Serving
Calories: approximately 155 Protein: approximately 7g Fat: approximately 11g Total Carbohydrates: approximately 10g Fiber: approximately 4g Net Carbs: approximately 6gMake Your Next Keto Dinner Easier
These garlic Parmesan Brussels sprouts are simple enough for a regular weeknight but flavorful enough to serve at Thanksgiving, Christmas, or a special dinner.
Pair them with chicken, steak, ham, or prime rib and you’ve got an easy low carb meal without needing a complicated side dish.
