Spinach Stuffed Mushrooms Recipe

Spinach Stuffed Mushrooms are a delicious and easy vegetarian and low-carb recipe sure to please a crowd. Simply mix artichoke hearts and frozen spinach with cream cheese and mozzarella, then stuff the filling into baby bella or white button mushrooms to bake in the oven. In less than 30 minutes, you’ll have an impressive snack or appetizer for a Christmas or New Year Party.

What happens when spinach artichoke dip and portobello mushrooms have a food baby?

These spinach stuffed mushrooms are born!

Your low-carb and vegetarian guests will be doing a little happy dance, too, when they find out they can eat as many as they want. 😉

And while these cute mushroom caps look like they would be the appetizer served at a fancy-schmancy dinner party…

They’re actually super EASY to throw together and can be ready in under 30 minutes!

(If you’ve got some guests who like their meat, you might want to check out these Crab Stuffed Mushrooms, too!)

Ingredients

The simple ingredients to make these stuffed mushrooms are:

• Mushrooms. Small-medium sized mushrooms are the best to use if serving these mushrooms as a party appetizer or snack. Baby Bella mushrooms are essentially miniature portobello mushrooms and are also referred to as “cremini mushrooms“. They have a stronger and meatier flavor than button mushrooms and are a beautiful brown color. Button mushrooms, otherwise known as “white mushrooms,” are the most commonly found mushroom throughout the United States. These are a lighter color and have the least flavor. Either way, you’ll need about 1 pound, or roughly 15 mushrooms.
• Spinach. Frozen spinach is thawed and drained before being mixed into the filling.  You can use fresh, but you will need to make sautéed spinach before adding it.
• Artichoke. Using canned artichoke hearts is the easiest way.  Make sure you finely chop them before mixing them in. (You’ll have quite a bit of the can left that you can use up in these Spinach Artichoke Stuffed Chicken Breasts.)
• Cream cheese. The bulk of the filling is made up of this soft and creamy cheese.  Make sure it’s at room temperature for the easiest mixing. If you’re dairy-free you can also try substituting with a vegan variety instead.
• Shredded cheese. Mozzarella cheese is the recommended variety to use, but gruyere or even Monterrey Jack may be substituted.
• Mayo. Another major component of the filling is this egg-based spread.  You can also use Miracle Whip, Avocado oil-based mayo, or even a vegan substitute instead.
• Parmesan Cheese. We’re tripling down on the cheesy deliciousness by adding in this sharp and salty cheese.  Once again, if you’re dairy-free you can opt to use a vegan alternative or even a bit of nutritional yeast.
• Onions. Finely chopped green onions or chives give a nice bite to the filling mixture.
• Seasonings. A bit of minced garlic, salt, and pepper combine to give the majority of the flavor to the spinach filling.

Cook’s Secret:  Did you know portobello, cremini, and button mushrooms are actually all the same species of mushroom?  (Agaricus bisporus) The only difference is the amount of time they have been allowed to age.

How to Make Spinach Stuffed Mushrooms

These are the simple instructions for this stuffed mushroom recipe.

Straining the Spinach

A very key part of making the spinach and artichoke filling mixture is straining the spinach.

If you leave too much water in it your filling will end up being too watery when baked.

The frozen spinach must be completely thawed before straining in order to get all of the liquid out.  You can do this by placing it in the refrigerator a day or two before using.  Or, if you’re pressed for time, pop it in the microwave at medium heat for a minute or so to defrost it.

Once the spinach is thawed, the easiest way to drain previously frozen spinach is to use a dish towel or cheesecloth.

Place about twice as much frozen spinach as the recipe calls for into your towel.  Wring out the spinach over a bowl or in the sink.  Repeat this until you no longer get ANY liquid from the spinach.

Measure the spinach AFTER it has been thoroughly drained to get the right amount you need for the recipe.

Prepare the Mushrooms

Clean mushrooms with a damp paper towel to remove any dirt and debris.

Avoid soaking them in water as this will dilute their flavor.

Remove the stems from the mushrooms by pulling them to one side and then snapping them off.

You can also use a knife to cut them off if the stems do not snap easily.

Place mushrooms on a large baking sheet that has been lined with parchment paper.

Spinach Artichoke Filling

Mix together cream cheese, mayonnaise, Mozzarella cheese, garlic, salt, and pepper.

Add in the artichoke hearts, spinach, and green onions. Stir until just combined.

Bake in Oven

Fill each mushroom cap with 1 to 1 ½ tablespoons of the spinach filling mixture. Pay careful attention not to load them with more filling than they are tall to prevent overflow while baking.

Sprinkle about a teaspoon of breadcrumbs over each filled mushroom.

Bake in a preheated oven for 20 minutes, or until the tops become crispy and golden brown.

Meal Prep and Storage

• To Prep-Ahead: One of the best things about this recipe is that they are extremely easy to prepare ahead of time. You can either make the filling or completely stuff the mushrooms, but bake within 24 hours.
• To Store: Keep leftovers in an airtight container in the fridge for up to 2 to 3 days.
• To Freeze: These stuffed mushrooms are best frozen unbaked. First flash-freeze by placing in a single layer on a baking sheet for a few hours and then transfer the mushrooms to a freezer-safe container and freeze for up to 6 months.
• To Reheat: Pop these back in the oven for the best texture.

FAQs

Dietary Modifications

The recipe you’ll find below is already gluten-free, vegetarian, and low-carb as written. Here are some adjustments and substitutions you can make to help it fit your other dietary requirements:

• Dairy-free: Opt for a dairy-alternative cheese.
• Vegan: Choose vegan cheese and mayonnaise.

Expert Tips and Tricks

• Not too big. Be sure to get smaller mushrooms so they cook evenly.
• Don’t soak. If you submerge the mushrooms, they will lose some flavor.
• Strain well. Take time to thoroughly remove all of the water from the spinach so your filling isn’t watery.
• Top ’em off. Don’t forget the breadcrumbs for a crispy topping.
• Party time. These mushrooms are perfect for a holiday get together.

More Party Food Appetizer Ideas

Are you throwing a party or holiday get-together?  Here are a few other appetizer ideas to go alongside these stuffed mushrooms:

• Air Fryer Sweet Potato Fries
• Maryland Crab Cakes
• Sheet Pan Nachos
• Air Fryer Chicken Nuggets
• Easy Tomato Bruschetta
• Roasted Tomato Salsa
• Air Fryer Pickles
• Smoked Salmon Dip
• Blueberry Goat Cheese Log
• Hot Spinach Artichoke Dip
• Pigs in a Blanket