Ready & Packaged Foods
All →Vegetables & Legumes
All →Desserts & Confectionery
All →Meat & Protein
All →Grains & Bakery
All →Beverages
All →Milk & Dairy
All →
Source of protein and vitamin B12
In season: Spring · Summer · Autumn · Winter
CALORIES · 100 G
GI
POTASSIUM · 100 G
FIBER · 100 G
1 piece (medium) of Red onion omelet (120 g) has 185 calories. That works out to 154 calories per 100 g. It contains 4 g of carbs, 13.8 g of protein, 12.8 g of fat and 0.7 g of fiber. Its 19.2 µg of Biotin covers 64% of the Daily Value. Its glycemic index is 15 (low), so it raises blood sugar slowly.
Selected: 1 piece (medium) · 120 g
185
KCAL / 120G
Carbs
4g
· 1% DV
Protein
13.8g
· 28% DV
Fat
12.8g
· 16% DV
Fiber
0.7g
· 3% DV
DV is the share of the daily value covered, on a 2,000 kcal reference diet.
Calories come from: Carbs 9% · Protein 30% · Fat 61%
| Nutrient | Amount | % DV |
|---|---|---|
| Calories | 185 kcal | |
| Total fat | 12.8 g | 16% |
| Saturated fat | 3.96 g | 20% |
| Trans fat | 0.06 g | |
| Sodium | 158 mg | 7% |
| Total carbohydrate | 4 g | 1% |
| Fiber | 0.7 g | 3% |
| Protein | 13.8 g | 28% |
Calories: Calories measure energy. Average daily need is 2,000 kcal. Excess calories are stored as fat, too few cause weight loss.
Carbs: Your body's primary energy source. The brain runs exclusively on carbs. Daily need: 275g.
Protein: Essential for muscle repair and cell growth. Daily need: 50g. Keeps you full and boosts metabolism.
Fat: Needed for hormone production and vitamin absorption. Daily need: 78g. Limit saturated fats, choose unsaturated.
Fiber: Critical for digestive health and satiety. Daily need: 28g. Stabilizes blood sugar, lowers cholesterol.
Log this food in EatBetter
100,000+ people use it
📸 Scan the code to get the app free.

| Serving | Amount | Calories |
|---|---|---|
| 1 piece (medium) | 120 g | 185 kcal |
| 1 serving (quarter) | 30 g | 46 kcal |
| 1 slice (thin) | 40 g | 62 kcal |
| 1 serving (half) | 60 g | 92 kcal |
| 1 piece (small) | 75 g | 116 kcal |
| 100 g | 100 g | 154 kcal |
| 1 piece (large) | 180 g | 277 kcal |
| 1 piece (extra large) | 240 g | 370 kcal |
| 1 serving (double) | 240 g | 370 kcal |
Calculated from 154 calories per 100 g.
To make a red onion omelet, finely slice the onion and sauté it until soft, then add beaten eggs and cook over low heat. Take the omelet off the heat once the eggs are just set so they stay tender.
Yes, sauté the red onion first for a milder, softer result. Adding it raw can leave the onion sharp and crunchy by the time the eggs are cooked; soften it in the pan before pouring in the eggs.
Cheese, fresh herbs, black pepper, and chopped bell pepper all work well in a red onion omelet. Add cheese near the end so it melts, and season carefully if the cheese is already salty.
Cook the red onion until its released moisture has evaporated before adding the eggs. A crowded pan or very high heat can also make a red onion omelet cook unevenly, so use a suitably sized pan and moderate heat.
Feta and cheddar both pair well with the sweetness of cooked red onion in an omelet. Crumble or grate the cheese over the eggs as they begin to set, then fold the omelet so the cheese warms without overcooking the eggs.
For a fluffy red onion omelet, beat the eggs until the whites and yolks are fully combined, then cook them gently in a warm pan. Avoid pressing the omelet down; covering the pan briefly helps the top set without drying the base.
Serve a red onion omelet with toast, a green salad, or sliced tomatoes for a simple meal. Fresh herbs add brightness, while potatoes or roasted vegetables make it more substantial without competing with the onion.
Yes, you can bake a red onion omelet in an oven-safe dish. Soften the onion in a pan first, mix it with the beaten eggs and any additions, then bake until the centre is set; avoid leaving it in the oven too long.
Refrigerate leftover red onion omelet in a covered container once it has cooled, rather than leaving it out for an extended period. Use it soon for the best texture, and discard it if its smell or appearance changes.
Yes, reheat a red onion omelet gently in a covered pan over low heat or in short bursts in the microwave. Gentle heating helps prevent the eggs from turning rubbery; reheat only the portion you plan to eat.
Vitamins
Biotin
19.2µg · 64% DV
B12
1.26µg · 53% DV
B5
1.5mg · 30% DV
B2
0.38mg · 29% DV
Minerals
Selenium
30µg · 55% DV
Phosphorus
216mg · 31% DV
Iodine
34µg · 23% DV
Zinc
1.38mg · 13% DV
Sodium
158mg · 7% DV
Potassium ⭐
186mg · 5% DV
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
To burn the 185 calories in 1 piece (medium) (120 g):
🚶
Walking (5 km/h)
🏃
Running (8 km/h)
🚴
Cycling
🏊
Swimming
Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.
A red onion omelet is made by cooking beaten eggs with sliced or chopped red onion in a pan. The onion may be softened first for a sweeter, tender bite, or left slightly crisp for more contrast. It is a simple home-style variation on the omelet, easy to adapt with herbs or a little cheese.
Serve it warm for breakfast or brunch with toast, or pair it with a salad for a light lunch. Eggs make it a source of protein and vitamin B12, while the onion adds flavour without making the dish heavy. For a lighter version, soften the onion with just a little oil and add fresh greens on the side.
High
How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.
Medium
An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.
Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.
NOVA 2
Minimally Processed
1. Unprocessed
2. Minimally Processed
3. Processed
4. Ultra-Processed
NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.
Contains these allergens:
Vegan
— Not suitable
Vegetarian
✓ Suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
✓ Suitable
Low FODMAP
— Not suitable
SATURATED
3.96g
MONOUNSATURATED
5.04g
POLYUNSATURATED
2.16g
Omega 6:3 ratio 21.8:1
Above the ideal 4:1 (21.8:1).
Ask the AI nutrition coach — calories, portions, alternatives and more, answered in seconds in the app.
Nutrition data compiled from USDA FoodData Central and scientific sources.