Crab-Stuffed Portobello Mushrooms combine a savory crab filling with roasted portobello caps for a quick, elegant weeknight dinner or a standout party dish. Think crab cake flavors tucked into a hearty mushroom — familiar, yet more substantial than the usual appetizer-sized stuffed mushrooms.
Our household loves seafood in all forms — fish, shellfish, and everything in between. Favorite recipes often requested at our table include Drunken Clams, Baked Cod with Garlic Panko, and Lemon Butter Shrimp Scampi. Occasionally I’ll indulge in a lot of sushi, too. This crab-stuffed portobello recipe is one of my latest favorites: roasted mushroom caps filled with a classic crab cake-style mixture that’s rich, flavorful, and surprisingly easy to prepare.
The filling features refrigerated lump crab meat tossed with finely chopped onion and celery, crushed Saltine crackers, mayonnaise, a beaten egg, Old Bay seasoning, Dijon mustard, Worcestershire sauce, and fresh parsley. These ingredients bind together to highlight the crab while adding complementary savory notes and a touch of creaminess.
When lump crab meat goes on sale, pick up a can or two — you’ll want to keep these on rotation for dinners or when entertaining. They’re simple to assemble and present beautifully on a platter.
Why you’ll love this recipe
If you enjoy crab cakes and mushrooms, these stuffed portobellos will be a hit. Key benefits include:
- Fast and simple — Ready in about 30 minutes. Prep requires basic chopping and mixing and uses standard kitchen tools.
- Versatile — Serve the large portobello caps as a main course or switch to smaller cremini or button mushrooms to create appetizers.
- Crowd-pleasing — Packed with lump crab and seasoned for depth, these feel gourmet and always impress guests.
Ingredients & substitutions
Gather quality ingredients for the best results. Below are the major components and acceptable swaps. Refer to the recipe card for exact measurements.
- Large portobello mushrooms — Ideal for a single-serving main. For appetizers, use cremini or white button mushrooms.
- Olive oil — For brushing the mushrooms.
- Kosher salt and fresh ground black pepper — To season the mushrooms and filling.
- Lump crab meat — Refrigerated lump is preferred for texture and flavor. Avoid imitation crab for this recipe.
- Crushed Saltine crackers — Help bind the filling; crushed oyster crackers or Ritz are good alternatives.
- Onion and celery — Finely chopped for texture and aroma; green onions can be used instead of yellow onion.
- Mayonnaise, egg, fresh parsley, Worcestershire sauce, Old Bay seasoning, and Dijon mustard — Combine to make a flavorful, cohesive filling.
- Parmesan cheese — Sprinkle on top before baking; Romano, Grana Padano, or even mozzarella will work.
How to clean mushrooms
Mushrooms act like sponges, so avoid rinsing them under water. Wipe each cap gently with a damp paper towel to remove dirt. For portobellos, remove the stem and scrape out the dark gills from the underside if you plan to stuff them; leaving the gills is fine when grilling or roasting whole mushrooms.
Recipe details
Here’s a concise walkthrough. Full, step-by-step instructions and measurements are provided in the recipe card below.
1. Brush the mushrooms clean, remove stems, and scrape out gills.
2. Place caps stem-side down on a baking sheet, brush with olive oil, season with kosher salt and black pepper, and roast at 400°F for 10–12 minutes.
3. Gently mix the crab filling: lump crab, crushed crackers, onion, celery, mayonnaise, parsley, egg, Worcestershire, Old Bay, and Dijon mustard. Take care not to break up the crab too much.
4. Generously mound the crab mixture into each roasted portobello cap.
5. Top each filled cap with grated Parmesan.
6. Bake for 12–15 minutes, until the filling is heated through and the cheese is lightly browned.
Expert tip
After roasting the caps, drain any liquid that collects in the pan. Excess moisture will make the filling watery and the mushrooms soggy.
Frequently asked questions
Yes. Prepare them through the step just before baking, cover tightly, and refrigerate up to 24 hours. When ready to bake, bring them out while the oven preheats and bake at 400°F for 20–25 minutes until the filling reaches 165°F internally.
Absolutely. Use smaller white or cremini mushrooms about 2 inches across for bite-sized portions. There’s no need to pre-roast smaller mushrooms — just remove stems, fill, and bake at 400°F for roughly 20–25 minutes.
What to serve with stuffed mushrooms
These stuffed mushrooms are rich and satisfying on their own; pair them with simple sides to balance the meal. Try oven-baked fries, roasted root-vegetable fries, a light spinach and blueberry salad, or a fresh avocado and corn salad to complement the crab and mushroom flavors.
More seafood recipes like this
-
Lump Crab Stuffed Salmon
-
Cod Oreganata
-
Easy Crispy Coconut Shrimp
-
Jumbo Lump Crab Cakes with Chipotle
If you try this recipe, please leave a rating or comment and share a photo on Instagram — it’s always wonderful to see your versions.
Recipe
Crab Stuffed Portobello Mushrooms
Ingredients
- 4 large portobello mushrooms
- Olive oil
- Kosher salt
- Fresh ground black pepper
- 1 pound lump crab meat (check for shell bits)
- 1/2 cup crushed Saltine crackers
- 1/3 cup finely chopped onion
- 1/3 cup finely chopped celery
- 1/4 cup mayonnaise
- 2 tablespoons chopped fresh parsley
- 1 large egg, beaten
- 2 teaspoons Worcestershire sauce
- 1 teaspoon Old Bay seasoning
- 1 teaspoon Dijon mustard
- 2 tablespoons grated Parmesan cheese
Instructions
- Prep the pan: Preheat oven to 400°F. Line a rimmed baking sheet with foil or parchment and set aside.
- Prep the mushrooms: Wipe each mushroom with a damp paper towel, remove stems, and scrape out the gills. Place caps stem-side down on the baking sheet, brush with olive oil, and season with kosher salt and black pepper.
- Roast the mushrooms: Roast for 10–12 minutes until slightly softened but still holding shape. Drain any liquid and set aside.
- Make the crab filling: In a large bowl, gently combine crab meat, crushed crackers, onion, celery, mayonnaise, parsley, egg, Worcestershire, Old Bay, and Dijon. Toss carefully to keep crab lumps intact.
- Fill the mushrooms: Mound about 1 cup of the crab mixture into each mushroom cap and gently pat down. Sprinkle with Parmesan.
- Bake: Bake 12–15 minutes until heated through and the topping is lightly browned. The filling should reach 165°F on an instant-read thermometer.
Notes
Make ahead: Assemble through the step before baking, cover, and refrigerate up to 24 hours. Bake at 400°F for 20–25 minutes when ready.
For appetizers: Use 2-inch white or cremini mushrooms; no pre-roasting is necessary. Remove stems, fill, and bake at 400°F for 20–25 minutes.
Nutritional information is an estimate based on ingredients and methods used.