Quick Overview
- Dish: Baked portobello mushroom caps filled with a light, lump crabmeat stuffing
- Flavor Profile: Sweet crab balanced by earthy mushrooms, lemon, thyme, and mild melted cheese
- Key Technique: Pre-baking the mushroom caps prevents excess moisture from watering down the filling
- Method: Mushroom caps are pre-baked, filled with crab stuffing, then baked until golden
- Servings: 4
- Total Time: 45 minutes
- Effort Level: Simple
A Lighter Take on Crab Stuffed Mushrooms
These crab stuffed portobello mushrooms are the kind of seafood recipe that works equally well for a casual dinner at home or an easy appetizer for entertaining. Pre-baking the mushroom caps keeps them from turning watery, while the flavor of the filling stays focused on sweet lump crabmeat accented with garlic, thyme, lemon, and just enough cheese to hold everything together.
We developed this recipe as a lighter alternative to traditional crab-stuffed mushrooms that can sometimes feel overly rich or breadcrumb-heavy. The portobello caps add enough substance to serve as a light seafood dinner when served with a simple vegetable or salad, but the smaller portions also fit naturally into a dinner party menu or holiday appetizer spread.
Ingredient Notes and Substitutions
A few key ingredients make this recipe work – here’s what to know. A complete list with quantities is in the recipe card below.
- Lump crabmeat: Pasteurized lump crabmeat has a delicate, sweet flavor and tender texture that works well in this filling. Be gentle when mixing so the larger pieces stay intact, and plan to use any leftovers within 2 days of opening.
- Portobello mushroom caps: When shopping, choose firm mushroom caps with even color and minimal moisture. Pre-baking them before stuffing helps release excess liquid and keeps the filling from becoming watery.
- Mild shredded cheese: Muenster or Monterey Jack melt smoothly without overpowering the crab. Avoid sharper cheeses like cheddar, which can dominate the filling.
- Panko breadcrumbs: Panko keeps the stuffing light and helps absorb moisture without making the filling dense.
- Fresh lemons: Lemon juice brightens the crab filling, and serving the mushrooms with lemon wedges adds fresh contrast to the rich seafood and cheese.
- Fresh thyme: Thyme adds a subtle earthy note that pairs naturally with both crab and mushrooms. Fresh thyme is preferred, but dried thyme works in a pinch.
A Quick Look at Preparation
Crab-Stuffed Portobello Mushrooms with Lemon & Thyme
Here’s how this dish comes together, along with a few tips for the best results. Full instructions are in the recipe card below.
The key to good crab stuffed portobello mushrooms is removing excess moisture before adding the filling. Start by removing the stems and gills from the mushroom caps, then give them a quick pre-bake. Once they soften slightly, blot away any liquid they release.
While the mushrooms bake, prepare the filling by combining the chopped mushroom stems with lump crabmeat, panko, onion, garlic, thyme, lemon juice, cheese, and egg. Mix gently so the crab stays in larger pieces rather than breaking down into a paste. The filling should hold together lightly without feeling dense.
Once stuffed, the mushrooms are baked until the filling is heated through and lightly golden around the edges. A final layer of melted cheese adds richness, while lemon wedges served alongside brighten the flavors and balance the earthy mushrooms and sweet crab.
Tested Tip for Better Texture
Mushrooms naturally release water as they cook, particularly large portobellos. Pre-baking the caps before stuffing allows some of that moisture to evaporate and gives you a chance to blot away the rest. It’s a simple step, but it makes a noticeable difference in keeping the filling light instead of soggy.
Make-Ahead Notes
You can prepare the crab filling up to a day in advance and refrigerate it tightly covered until ready to use. For the best texture, wait to stuff and bake the mushrooms until shortly before serving.
The mushroom caps can also be cleaned and pre-baked ahead of time. Once cooled, blot away any remaining moisture and refrigerate them separately from the filling.
If you need to fully assemble the mushrooms in advance, you can refrigerate them for a few hours before baking. Let them sit at room temperature briefly before putting them in the oven so they heat evenly.
More Easy Crab Recipes to Try
If you enjoy these crab stuffed portobello mushrooms, try our Maryland-Style Baked Crab Cakes, crisp-edged crab cakes with a light breadcrumb coating and balanced seasoning; Crab Louie Salad, a classic composed seafood salad with crisp vegetables and tangy dressing; or Linguine with Lump Crabmeat, a simple pasta tossed with crab, tomatoes, garlic, and white wine butter sauce.
Crab-Stuffed Portobello Mushrooms
Ingredients
- 4 portobello mushroom caps, 3-1/2 to 4" diameter
- Salt and freshly ground black pepper
- 8 oz lump crabmeat, fully-cooked, pasteurized
- 1/2 cup panko crumbs
- 2 tablespoons chopped sweet onion
- 1 or 2 cloves garlic, minced
- 1 teaspoon fresh thyme leaves, (or 1/4 teaspoon dried)
- 1-1/2 tablespoons freshly squeezed lemon juice, from 1/2 lemon
- 2/3 cup shredded Muenster or Monterey Jack cheese, divided
- 1 egg, lightly beaten
- Lemon wedges, for serving
Instructions
- Preheat the oven to 375°F and coat a sheet pan with nonstick spray.
- Remove the stems from the portobello caps and finely chop them. Using a spoon, gently scrape out the dark gills and wipe the caps clean with paper towels.
- Arrange the mushrooms gill side up on the prepared pan and season lightly with salt and pepper. Bake for 8 minutes, then carefully blot away any liquid released by the mushrooms with paper towels. Set aside.
- While the mushrooms pre-bake, combine the chopped mushroom stems, crabmeat, panko, onion, garlic, thyme, lemon juice, and all but 2 tablespoons of the cheese in a mixing bowl.
- Season the mixture lightly with salt and pepper, then fold in the beaten egg just until combined. Be careful not to break up the crabmeat too much.
- Divide the filling among the mushroom caps, gently pressing it into place and mounding it slightly on top.
- Bake for 10 to 12 minutes, until the filling is heated through and lightly golden around the edges.
- Top the mushrooms with the reserved cheese and return to the oven for 2 to 4 minutes, until melted and bubbly.
- Serve hot with lemon wedges and hot sauce if desired.
Notes
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Can imitation crab may be used in this recipe? I understand it won’t be as flavorful as the real thing just wondering.
Hi Elvira,
I haven’t tried it, but I see no reason why you couldn’t use imitation crab in this recipe. I happen to like the flavor and texture of imitation crab quite a bit and I’d be interested to know how the recipe turns out.
Could I please have the recipe for the clam appetizer? Also, the mushrooms were delicious!
Hi Cheryl,
We’re glad to hear you enjoyed the mushrooms. I’ve sent the recipe to you via email.
This sounds wonderful – I can’t wait to try it. If it’s not too much trouble, would you please email me the clam appetizer mentioned in the comments? Thank you.
Recipe has been sent.
I added bacon and shrimp. It turned out excellent. I used Parmesan for the extra cheese. I also had to cook for longer but I think I over filled them in
Hi Jaime,
The bacon and shrimp sound like tasty additions – thanks for sharing the idea. It’s not surprising that the extra filling may have required a little additional cook time. I’m glad you enjoyed the dish overall though.
I made your recipe, I enjoyed it very much. The only thing was I had to leave the mushrooms in for 5 extra min., Not sure if I over filled the mushrooms. Wondering if a seafood creoal sauce on the side would give it additional taste, however do love the woody flavor.
Hi there,
I think a creole sauce would be a really nice accompaniment for the mushrooms and I would actually consider including a small amount in the crab stuffing itself. Just be careful that the mixture doesn’t become too loose. Let us know if you give it a try.
I made these for dinner tonight. Super simple to make. I would have given 5 stars, but I thought that the thyme was just a little too much. Otherwise, they were very tasty. I will make these again, but cut back or eliminate the thyme.
Hi Holly,
I’m glad you enjoyed the recipe overall. We’re located in Florida and the fresh thyme available to us is pretty mildly flavored. Based on your feedback, I’ll adjust the recipe instructions a bit.
Delicious, I used cheddar cheese for the stuffing, and mozzarella for the topping and sprinkled parsley on top. Only made 2 mushrooms and cut recipe in half, I served with toasted tortilla triangles.My husband loved it.
Hi Lynne,
I haven’t made the stuffed Mushrooms yet but will in the very near future. I’m doing some stuffed mushrooms that aren’t Portabellas first to go with some steaks for me and my wife. The reason I’m writing is that I would like a copy of the recipe you shared with Linda Callahan on March 25, 2023. I would like to give that a try. It is about a Clam Appetizer.
When I try your recipe on Stuffed Crab Portobello Mushroom, I will let you know how they turned out.
Hi Michael,
I sent it to you via email.
Im going to make this for my daughter since she is a vegetarian & doesn’t eat turkey
Thank you for. Also I just read about a clam appetizer may I please have that recipe.
Hi Petie,
I hope your daughter enjoys the dish. I’ve emailed the clam recipe for you.
I like to try new recipes, I read the reviews, and was inspired to try it. Unfortunately, my husband and I were not impressed, just a waste of good crab meat
We’re sorry to hear that you didn’t enjoy this dish, however, personal taste in food is subjective, and occasionally the ingredients we purchase can fall short of our expectations.
Absolutely Deliciouso. Everybody Craved more. So fast a Easy .can u please send us the clam appetizer..
Hi there,
I’m glad to hear you enjoyed this recipe – thanks for letting us know. Check your email for the clam recipe.
Can I make this recipe a day ahead and without baking refrigerate overnight to cook the next day. ?
Hi Linda,
In the past, I’ve cleaned the mushrooms and prepared the crab mixture, refrigerated them separately overnight, then stuffed them right before baking. However, I think you could stuff them ahead of time just as easily and they would be just fine. The only added advice I have for either method is that you might need a couple of extra minutes in the oven because the ingredients are more thoroughly chilled.
I have a similar recipe from my mom it was around 1960. Mom used a beaten egg white and a small amount of cream cheese, everything else in your recipe is the same. Absolutely delicious. I have a ❓. Mom also made an appetizer she called ” clam puffs”! Sooo good. She made a mousse-like consistency with beaten egg whites and chopped clams, I think scallions and fresh parm. On a crostini toasted until barely browned. Have you ever seen a recipe like that? If so I would like to hear from you soon. Thank you, looking forward to more dishes.
Hi Linda,
Thanks for sharing your version of the crab-stuffed portobellos. The beaten egg whites are a nice touch. They’d lighten up the filling a little more. And of course, you can never go wrong with cream cheese.
I did a little research and found a recipe for a clam appetizer that sounds like what you’re looking for. Since I don’t know the source and can’t provide a link or proper credit to the author, I won’t publish it here. I can share it with you directly though, so please check the email address you used to leave a comment.