Healthy Recipes Ingredient Mushroom French Onion–Stuffed Mushroom Bites 5.0 (4) 4 Reviews Inspired by classic French onion soup, these stuffed mushrooms pack the rich, savory flavors of caramelized onions, melted Gruyère and a hint of sherry vinegar into a bite-size appetizer. A quick broil gives the tops their golden, bubbly finish. Garnished with fresh thyme, they’re the perfect addition to holiday spreads, dinner parties or anytime you want a warm, crowd-pleasing starter. By Isabelle Easter Isabelle Easter Isabelle Easter is the Test Kitchen Fellow for People Inc.’s 2025-2026 fellowship program. She has been passionate about all things food-related from a young age, enjoying participating in bake sales and contributing to family dinners. EatingWell's Editorial Guidelines Published on September 17, 2025 Reviewed by Dietitian Emily Lachtrupp, M.S., RD Reviewed by Dietitian Emily Lachtrupp, M.S., RD See More Emily Lachtrupp is a registered dietitian experienced in nutritional counseling, recipe analysis and meal plans. She's worked with clients who struggle with diabetes, weight loss, digestive issues and more. In her spare time, you can find her enjoying all that Vermont has to offer with her family and her dog, Winston. EatingWell's Editorial Guidelines Save Rate PRINT Share Jump to recipe Active Time: 1 hr Total Time: 1 hr 15 mins Servings: 8 Nutrition Profile: No Added Sugar Sesame-Free Nut-Free Soy-Free High-Fiber High-Protein Egg-Free Jump to Nutrition Facts Caramelizing onions until deeply golden builds rich, sweet-savory flavor.Mushrooms contain selenium, an antioxidant that may help prevent cardiovascular disease. These mushroom bites are perfect for a game-day spread or holiday gathering. Photographer: Brittney Cottrell, Food stylist: Isabelle Easter, Prop Stylist: Keoshia McGhee. Cook Mode (Keep screen awake) Ingredients 1/2x 1x 2x Oops! Something went wrong. Our team is working on it. This recipe was developed and tested at its original yield and has not been tested at other yields. Note that only the ingredient list is scaled, so you may need to make adjustments to ingredient amounts, cooking times and equipment sizes in the recipe steps. Scaling could also impact the nutrition analysis. Original recipe (1X) yields 8 servings 24 medium cremini mushrooms (about 1 pound) 2 tablespoons extra-virgin olive oil, divided ¾ teaspoon salt, divided 1 tablespoon unsalted butter 2 large yellow onions, sliced (about 6 cups) 1 tablespoon sherry vinegar ½ cup unsalted beef broth 1 cup shredded Gruyère cheese 2 tablespoons dry whole-wheat breadcrumbs Fresh thyme leaves, for garnish (optional) Directions Preheat oven to 325°F. Remove and discard stems from 24 mushrooms; use a spoon to scrape and discard gills. Toss the mushroom caps with 1 tablespoon oil and ¼ teaspoon salt on a large rimmed baking sheet. Arrange cap-side up and bake until tender, 10 to 15 minutes. Meanwhile, heat 1 tablespoon butter and the remaining 1 tablespoon oil in a large skillet over medium heat. Add sliced onions and the remaining ½ teaspoon salt; cook, stirring often, until deeply golden brown, about 40 minutes. Stir in 1 tablespoon vinegar, scraping up any browned bits; cook until evaporated, about 1 minute. Add ½ cup broth and cook, stirring often, until the onions are glazed and most of the liquid has evaporated, about 3 minutes. Photographer: Brittney Cottrell, Food stylist: Isabelle Easter, Prop Stylist: Keoshia McGhee. Fill each mushroom cap with about 2 teaspoons caramelized onions. Top the mushrooms with 1 cup Gruyère and sprinkle with 2 tablespoons breadcrumbs. Bake until the cheese is melted, about 10 minutes. Increase oven temperature to broil; broil until the cheese is bubbly and the breadcrumbs are golden, 3 to 5 minutes. Garnish with thyme, if desired. Photographer: Brittney Cottrell, Food stylist: Isabelle Easter, Prop Stylist: Keoshia McGhee. EatingWell.com, September 2025 Save Rate Print Nutrition Facts (per serving) 192 Calories 10g Fat 20g Carbs 8g Protein Show Full Nutrition Label Hide Full Nutrition Label Nutrition Facts Servings Per Recipe 8 Serving Size 3 mushroom bites Calories 192 % Daily Value * Total Carbohydrate 20g 7% Dietary Fiber 3g 10% Total Sugars 9g Added Sugars 0g 0% Protein 8g 16% Total Fat 10g 13% Saturated Fat 4g 21% Cholesterol 19mg 6% Vitamin A 50µg Vitamin C 10mg 11% Vitamin D 0µg Vitamin E 1mg 4% Folate 35µg Vitamin K 4µg Sodium 372mg 16% Calcium 184mg 14% Iron 1mg 4% Magnesium 29mg 7% Potassium 441mg 9% Zinc 1mg 11% Vitamin B12 0µg Omega 3 0g Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate. * Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.) (-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.