Ready & Packaged Foods
All →Vegetables & Legumes
All →Desserts & Confectionery
All →Meat & Protein
All →Grains & Bakery
All →Beverages
All →Milk & Dairy
All →
Low-calorie mushroom and onion dish providing fiber, selenium, and B vitamins
CALORIES · 100 G
GI
POTASSIUM · 100 G
FIBER · 100 G
1 serving (medium) of Button mushrooms with onion (120 g) has 41 calories. That works out to 34 calories per 100 g. It contains 6.1 g of carbs, 3.1 g of protein, 0.6 g of fat and 2.2 g of fiber. Its 1.8 mg of B5 covers 36% of the Daily Value. Its glycemic index is 15 (low), so it raises blood sugar slowly.
Selected: 1 serving (medium) · 120 g
41
KCAL / 120G
Carbs
6.1g
· 2% DV
Protein
3.1g
· 6% DV
Fat
0.6g
· 1% DV
Fiber
2.2g
· 8% DV
DV is the share of the daily value covered, on a 2,000 kcal reference diet.
Calories come from: Carbs 58% · Protein 29% · Fat 13%
| Nutrient | Amount | % DV |
|---|---|---|
| Calories | 41 kcal | |
| Total fat | 0.6 g | 1% |
| Saturated fat | 0.1 g | 1% |
| Trans fat | 0 g | |
| Sodium | 9.6 mg | 0% |
| Total carbohydrate | 6.1 g | 2% |
| Fiber | 2.2 g | 8% |
| Protein | 3.1 g | 6% |
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 serving (medium) | 120 g | 41 kcal |
| 1 tablespoon (small) | 18 g | 6 kcal |
| 3 tablespoon (medium) | 54 g | 18 kcal |
| 1 cup (diced) | 90 g | 31 kcal |
| 100 g | 100 g | 34 kcal |
| 1 serving (large) | 180 g | 61 kcal |
| 1 piece (whole) | 220 g | 75 kcal |
| 1 pack (small) | 250 g | 85 kcal |
Calculated from 34 calories per 100 g.
To make button mushrooms with onion, soften sliced onion in a pan, add sliced mushrooms, and cook over fairly high heat. Avoid crowding the pan so the mushrooms brown instead of releasing too much liquid.
Button mushrooms with onion work well with olive oil or butter, black pepper, garlic, and herbs such as thyme or parsley. Add delicate herbs near the end so their flavor stays fresh.
Button mushrooms with onion can turn watery when the pan is crowded or the heat is too low. Pat the mushrooms dry, cook them in a roomy pan, and add salt toward the end.
Cook the onions first if you want them soft and sweet; add the mushrooms once the onions begin to soften. You can cook them together, but the mushrooms may release liquid before the onion is tender.
No, button mushrooms do not need soaking before making button mushrooms with onion. Wipe off dirt with a damp cloth or briefly rinse them, then dry them well so excess water does not collect in the pan.
Yes, button mushrooms with onion make a simple pasta topping. Toss them with cooked pasta and a little cooking water, or add herbs and grated cheese for a richer finish.
Yes, you can make button mushrooms with onion without oil by cooking them in a nonstick pan with a small splash of water. Let the mushrooms release their own moisture, then cook until the excess liquid evaporates.
Cooked button mushrooms with onion keep for about 3–4 days in a covered container in the refrigerator. Chill them promptly after cooking, and reheat only the portion you plan to eat.
Yes, button mushrooms with onion can be frozen, though thawing makes the mushrooms softer and may release liquid. Cool the dish first, freeze it in a sealed container, and reheat it thoroughly after thawing.
Yes, button mushrooms with onion can be a useful everyday side dish because it pairs easily with grains, pasta, or a main course. Keep added salt and cooking fat moderate, especially if serving it often.
Vitamins
B5
1.8mg · 36% DV
Biotin
9.6µg · 32% DV
B3
4.92mg · 31% DV
B2
0.38mg · 29% DV
Minerals
Copper
0.29mg · 32% DV
Selenium
10µg · 18% DV
Phosphorus
98mg · 14% DV
Potassium ⭐
348mg · 10% DV
Sodium
9.6mg · 0% DV
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
To burn the 41 calories in 1 serving (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.
Button mushrooms with onion is a simple dish of sliced cultivated mushrooms cooked with onion, usually in a pan with a little oil and seasoning. It is a familiar home-cooking combination in many places rather than a dish tied to one specific region, and cooks may add herbs, garlic or spices to suit the meal.
The mushrooms turn tender and savoury, while softened onion brings a mild sweetness. Serve it as a side with eggs, grains or roasted vegetables, or spoon it onto toast for a light lunch. The mushrooms’ soft texture also works well folded into an omelette. It is a low-calorie choice, with 34 calories per 100 g, and supplies some fibre; use only a little oil if you want to keep the dish especially light.
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.
No known major allergens
Vegan
✓ Suitable
Vegetarian
✓ Suitable
Gluten-Free
✓ Suitable
Dairy-Free
— Not suitable
Mediterranean
✓ Suitable
Paleo
✓ Suitable
Whole30
— Not suitable
DASH
— Not suitable
Keto
— Not suitable
Low FODMAP
— Not suitable
SATURATED
0.1g
MONOUNSATURATED
0.02g
POLYUNSATURATED
0.2g
Omega 6:3 ratio 19:1
Above the ideal 4:1 (19:1).
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.