Easy Air Fryer Caramelized Onions for Low-Carb Meal Prep

Transform simple sliced onions into rich, golden-brown perfection in a fraction of the traditional stovetop time. This air fryer method coaxes out deep, jammy natural sugars with minimal oil, creating a tender, savory-sweet texture that elevates any low-carb entree.

Equipment

• Air fryer (basket or tray style)
• Chef’s knife & cutting board
• Mixing bowl
• Silicone tongs

Ingredients

• 2 large yellow onions (sliced 1/4-inch thick)
• 1 tbsp olive oil (or avocado oil)
• 1/4 tsp fine sea salt
• 1 tbsp water (optional; for deglazing dry baskets midway)

Instructions

1. Preheat your air fryer to 330°F (165°C). In a bowl, toss the sliced onions with olive oil and salt until evenly coated.
2. Transfer the onions into the air fryer basket, spreading them out as evenly as possible; cook at 330°F for 10 minutes.
3. Open the basket, stir thoroughly with silicone tongs, and add 1 tablespoon of water if the tips look dry; this prevents scorching and mimics deglazing a pan.
4. Increase temperature to 350°F (175°C) and cook for another 8–10 minutes, shaking every 3–4 minutes until deep golden-brown, soft, and translucent.
5. Remove immediately from the hot basket and pair with grilled steaks, lean burger patties, or folded into egg-white scrambles.

Notes

Storage & Reheating: Warm in a dry non-stick skillet for 2 minutes or microwave for 20 seconds. Allergy Info: Naturally gluten-free, dairy-free, vegan, nut-free, and keto-friendly. Flavor Boosts: Add a dash of balsamic vinegar or a pinch of dried thyme during the last 3 minutes of cooking.

Nutrition

Calories: 55 · Fats: 3.5g · Cholesterol: 0mg · Sodium: 150mg · Potassium: 120mg · Total Carbohydrates: 6g · Fiber: 1.2g · Net Carbs: 4.8g · Sugars: 3.2g · Protein: 0.8g · Calcium: 18mg