How do I keep this recipe gluten-free?

Use certified gluten-free packaged ingredients and avoid shared utensils, boards, pans, or toppings that touched gluten-containing foods.

Can I adjust the main ingredients?

Yes. Use the ingredient replacement notes to choose swaps with similar moisture, protein, or cooking behavior.

What is the best way to serve it with mixed-diet family?

Serve the gluten-free recipe first with dedicated utensils, then keep any gluten-containing sides or toppings separate.

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Appetizers

Gluten-Free Savory Stuffed Portobello Mushrooms with Spinach and Sun-Dried Tomatoes

Name: Gluten-Free Savory Stuffed Portobello Mushrooms with Spinach and Sun-Dried Tomatoes
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Yield: 4 servings
Cuisine: Mediterranean-inspired
Ingredients: 4 large portobello mushroom caps, stems and gills removed; 2 tablespoons olive oil, divided; 1 small onion, finely chopped; 3 cloves garlic, minced; 4 cups fresh spinach leaves, roughly chopped; 1/3 cup sun-dried tomatoes, chopped (oil-packed, drained); 1/4 teaspoon sea salt; 1/4 teaspoon black pepper; 1/2 teaspoon dried oregano; 1/4 teaspoon crushed red pepper flakes (optional); 2 tablespoons fresh parsley, chopped; 1 tablespoon lemon juice; 1/4 cup gluten-free breadcrumbs (optional, for topping); Fresh basil leaves for garnish (optional)

By Freeflourish Test KitchenReviewed by Freeflourish Editorial TeamPublished Apr 18, 2026 · Updated Jul 7, 2026

Mediterranean-inspired 35 mins glutenfreevegetariandairyfreenutfreefamilyfriendlyappetizerlowcarbmealpreponepoteasy

A flavorful, gluten-free, dairy-free, and nut-free Mediterranean-inspired baked appetizer featuring stuffed portobello mushrooms filled with a savory blend of spinach, sun-dried tomatoes, garlic, and herbs. This easy low-carb, one-pot recipe is family-friendly and ideal for quick meal prep and healthy snacks.

Gluten-Free Savory Stuffed Portobello Mushrooms with Spinach and Sun-Dried Tomatoes

Prep 15 min

Cook 20 min

Total 35 min

Servings 4

Difficulty easy

Cuisine Mediterranean-inspired

Ingredients

Servings 4

4 large portobello mushroom caps, stems and gills removed
2 tablespoons olive oil, divided
1 small onion, finely chopped
3 cloves garlic, minced
4 cups fresh spinach leaves, roughly chopped
1/3 cup sun-dried tomatoes, chopped (oil-packed, drained)
1/4 teaspoon sea salt
1/4 teaspoon black pepper
1/2 teaspoon dried oregano
1/4 teaspoon crushed red pepper flakes (optional)
2 tablespoons fresh parsley, chopped
1 tablespoon lemon juice
1/4 cup gluten-free breadcrumbs (optional, for topping)
Fresh basil leaves for garnish (optional)

FreeFlourish gluten-free stuffed portobello mushrooms with spinach and sun-dried tomatoes ingredients

Instructions

Preheat your oven to 375 degrees F. Line a baking sheet with parchment paper or lightly grease it.
Brush the portobello mushroom caps on both sides with 1 tablespoon of olive oil and place them gill-side up on the prepared baking sheet.
In a large skillet, heat the remaining 1 tablespoon olive oil over medium heat.
Add the chopped onion and sauté for 3-4 minutes until softened.
Add the minced garlic and sauté for another 1 minute, stirring frequently to avoid burning.
Add the chopped spinach to the skillet and cook until wilted, about 3 minutes.
Stir in the chopped sun-dried tomatoes, sea salt, black pepper, dried oregano, and crushed red pepper flakes (if using). Cook for an additional 2 minutes to combine the flavors.
Remove the skillet from heat and stir in the fresh parsley and lemon juice. Adjust seasoning to taste.
Spoon the spinach and tomato mixture evenly into each mushroom cap, mounding it slightly.
If using, sprinkle gluten-free breadcrumbs on top of each stuffed mushroom for a slight crunch.
Bake in the preheated oven for 18-20 minutes, until the mushrooms are tender and the topping is lightly golden.
Remove from oven and let cool for a couple of minutes before garnishing with fresh basil leaves, if desired.
Serve warm as an appetizer or alongside a fresh salad for a light meal. Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently before serving.

FreeFlourish stuffed portobello mushrooms with spinach and sun-dried tomatoes finished dish

Tips

Allergen Overlap Note

Check every packaged ingredient for certified gluten-free status, especially spices, broths, sauces, seed products, and baking staples. Use clean prep surfaces, dedicated utensils, and fresh parchment or cookware when preparing stuffed portobello mushrooms with spinach and sun-dried tomatoes for someone with celiac disease.

Texture Expectations

The mushrooms should be juicy and tender while the spinach filling stays savory rather than watery. Roast the caps long enough to release moisture before serving so the stuffed centers hold together.

Dining With Non-GF Family Note

Serve the mushrooms from a dedicated gluten-free appetizer plate with a clean spatula. If bread, pasta, or crumb toppings are available for other eaters, keep them away from the mushroom platter.

Frequently Asked Questions

Can I make Gluten-Free Savory Stuffed Portobello Mushrooms with Spinach and Sun-Dried Tomatoes ahead?: Yes. Prepare the components ahead when practical, then store and reheat according to the storage guidance so the texture stays close to fresh.
How do I keep this recipe gluten-free?: Use certified gluten-free packaged ingredients and avoid shared utensils, boards, pans, or toppings that touched gluten-containing foods.
Can I adjust the main ingredients?: Yes. Use the ingredient replacement notes to choose swaps with similar moisture, protein, or cooking behavior.
What is the best way to serve it with mixed-diet family?: Serve the gluten-free recipe first with dedicated utensils, then keep any gluten-containing sides or toppings separate.

Ingredient Replacements

Fresh basil leaves for garnish: Use a certified gluten-free equivalent and choose a similar ingredient with matching moisture, texture, or cooking time. Check labels for shared-facility warnings when cooking for celiac disease or multiple allergies.
main vegetable: Use a certified gluten-free equivalent and choose a similar ingredient with matching moisture, texture, or cooking time. Check labels for shared-facility warnings when cooking for celiac disease or multiple allergies.
protein: Use a certified gluten-free equivalent and choose a similar ingredient with matching moisture, texture, or cooking time. Check labels for shared-facility warnings when cooking for celiac disease or multiple allergies.
seasoning: Use a certified gluten-free equivalent and choose a similar ingredient with matching moisture, texture, or cooking time. Check labels for shared-facility warnings when cooking for celiac disease or multiple allergies.
cooking fat: Use a certified gluten-free equivalent and choose a similar ingredient with matching moisture, texture, or cooking time. Check labels for shared-facility warnings when cooking for celiac disease or multiple allergies.

Storage and Reheating

Refrigerate stuffed mushrooms in an airtight container for up to 3 days. Reheat in a 350 degrees F oven until warm, then add fresh basil or lemon after reheating.

Read related air fryer guides and cooking tips.

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Gluten-Free Savory Stuffed Portobello Mushrooms with Spinach and Sun-Dried Tomatoes

Recipe Details

Ingredients

Instructions