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This Air Fryer Keto Roasted Brussels Sprouts and Onions recipe makes the most delicious side dish. With only a couple of ingredients, you can create the most delectable crispy and healthy side dish.

Roasted Brussels sprouts such a new revelation for me!

The best roasted Brussels sprouts are crisp and golden on the outside and tender on the inside. They’re full of irresistible caramelized flavour, which is both sweet and nutty.

And after falling in love with my Keto Caramelized Skillet-Roasted Brussels Sprouts, I knew I had to find more ways to create these delicious little gems!

Roasted Brussels sprouts really don’t need much seasoning, but for me to love them, they do need to have that extra little crispy outer crust.

Brussels sprouts are in season from September through March here in the U.S., although you can find them year-round.

Luckily for those of you who can't find fresh Brussels Sprouts, this recipe actually uses frozen Brussels Sprouts as well as frozen pearl onions.

But don't worry if you think that you will end up with a pile of frozen much because once you put these frozen vegetables in an air fryer, they crisp up perfectly!

a drizzle of mustard sauce over the roasted brussels sprouts

What is the nutritional value of 1 cup of Brussels Sprouts?

56 calories
4 grams of protein
4 grams of fibre

They are also touted to help control blood sugar, protect against cancer, boost the immune system, fight inflammation and heart disease, restore digestive health, protect the skin and eyes, improve brain health as well as to help support proper nerve function.

After reading all of these benefits, I knew I needed to come up with more recipes for these green little gems!

What ingredients do you need to make these Air Fryer Keto Roasted Brussels Sprouts and Onions?

frozen Brussels Sprouts (or fresh)
frozen pearl onions
olive oil
salt and pepper

What are pearl onions?

According to Wikipedia, the pearl onion:

is known as a button, baby or silverskin onion in the UK,
is also referred to as creamers in the US
it is a close relative of the leek,
it may be distinguished from common onions by having only a single storage leaf, similar to cloves of garlic
In France or Quebec, they are known as oignon grelot.

How do you make these Air Fryer Keto Roasted Brussels Sprouts and Onions?

allow the frozen vegetables to thaw slightly
slice the vegetables in half
allow them to fully thaw
toss them in olive oil
place them in an air fryer for 30-40 minutes
ENJOY!

What type of Air Fryer did I use to make this recipe?

I absolutely LOVE my Ninja Foodi All-In-One.

It is not only an air fryer but also a pressure cooker as well as a slow cooker. Since my kitchen is not massive, having 1 appliance instead of 3 is a blessing!

perfectly roasted brussels sprouts in an air fryer

Why do you allow the Brussels Sprouts and onions to thaw?

By allowing the veggies to thaw slightly, it makes slicing them much easier. IF you allow them to thaw all the way, they actually are harder to slice in half.

Do you have to allow the veggies to thaw before placing them in the air fryer?

Although you do not need to thaw the vegetables, it does cut down on the cooking time. If you place the veggies while they are still slightly frozen, you may need to increase the roasting time by 10 minutes.

perfectly seasoned roasted Brussels Sprouts and onions

What different spices can you use on these Air Fryer Brussels Sprouts and Onions?

The great thing about these Roasted Brussels Sprouts and Onions and you can make a few changes and create any flavour you are craving!

For Italian Roasted Brussels Sprouts:

Transfer your roasted sprouts to a serving platter, then lightly drizzle thick balsamic vinegar, balsamic glaze or reduction on top.
Finish the dish off with a sprinkle of red pepper flakes and grated Parmesan.

For Greek Roasted Brussels Sprouts

Squeeze a lemon wedge over the baked Brussels sprouts.
Add some oregano and some feta cheese

For Asian-Inspired Roasted Brussels

Lightly drizzle toasted sesame seed oil and a little coconut amino or soy sauce over the warm sprouts.
Finish it off with sesame seeds (white or black)

For Peanut-Thai Roasted Brussels Sprouts

Serve with a side of peanut butter mixed with a little soy sauce and a teaspoon of tamarind paste

What main meal can you serve these Air Fryer Brussels Sprouts and Onions with?