Keto Roasted Asparagus
Crisp-tender oven-roasted asparagus with garlic, Parmesan, and lemon. Just 2.7g net carbs per serving and ready in 25 minutes total, this fuss-free keto side pairs with any protein and turns a humble bunch of asparagus into a restaurant-worthy plate.
Head of Nutrition · June 18, 2026
Nutrition per serving
Per serving · makes 4. Values are estimates; brands vary.
This crispy, garlicky roasted asparagus is the kind of effortless side that disappears off the plate first. With golden Parmesan, a squeeze of bright lemon, and just 2.7g net carbs per serving, it's a weeknight keto staple that's ready in under half an hour.
Ingredients
- 1 lb fresh asparagus, woody ends trimmed
- 2 tbsp extra-virgin olive oil
- 3 cloves garlic, minced
- 1/3 cup grated Parmesan cheese
- 1/2 tsp kosher salt
- 1/4 tsp freshly ground black pepper
- 1/4 tsp red pepper flakes (optional)
- 1 tbsp fresh lemon juice
- 1 tsp lemon zest
- 2 tbsp grated Parmesan for finishing
Instructions
- 1
Preheat the oven to 425°F (220°C) and line a large rimmed baking sheet with parchment paper.
- 2
Pat the trimmed asparagus dry and spread it in a single layer on the baking sheet. Drizzle with olive oil, then scatter the minced garlic, salt, pepper, and red pepper flakes over the top. Toss with your hands until every spear is evenly coated.
- 3
Sprinkle the 1/3 cup Parmesan over the asparagus, then re-spread into a single layer so the spears roast rather than steam.
- 4
Roast for 12 to 15 minutes, until the asparagus is crisp-tender and the Parmesan has turned golden and crisp at the edges. Thicker spears may need an extra 2 to 3 minutes.
- 5
Remove from the oven and immediately drizzle with fresh lemon juice. Finish with the lemon zest and the remaining 2 tbsp Parmesan, then serve warm.
Tips & notes
- Choose medium-thick spears for the best texture — pencil-thin asparagus overcooks quickly, so check it at the 10-minute mark.
- Snap one spear to find the natural break point, then line up the bunch and trim the rest with a knife to remove the tough woody ends.
- Leftovers keep in an airtight container for up to 3 days; reheat in a hot oven or air fryer to revive the crispness rather than the microwave.
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Frequently asked questions
- How many carbs are in keto roasted asparagus?
- Each serving (this recipe makes 4) has 2.7g net carbs, 142 calories, 5.1g protein, and 12g fat, making it an easy fit for keto and low-carb diets.
- Is asparagus keto-friendly?
- Yes. Asparagus is one of the most keto-friendly vegetables, with only about 2g net carbs per cup. It's high in fiber and low in starch, so it slots easily into a low-carb day.
- Can I make this dairy-free?
- Absolutely. Skip the Parmesan and add 2 tbsp of nutritional yeast for a cheesy, savory note, or simply roast with extra olive oil, garlic, and lemon. The net carbs stay nearly identical.
