How To Make Spinach Stuffed Portobello Mushrooms

I love these stuffed portobello mushrooms – they are delicious and so pretty. They can work well as an appetizer, or serve them as a tasty side dish, as I did tonight.

Needless to say, the combination of mushrooms, spinach, onion, garlic and olive oil turns this recipe for stuffed portobello mushrooms into a nutritional powerhouse. Very healthy.

Stuffed and baked portobello mushrooms can become soggy. To avoid sogginess:

1. Wipe clean, don’t wash the mushrooms – they absorb water.

2. Pre-broil to release some of the water.

3. In the final stage of baking or broiling, broil or bake briefly, just until topping is browned. Baking too long will result in mushy mushrooms that have released their liquid into your filling. If that happens, you can still salvage the dish – carefully drain the liquid, and place the mushrooms on paper towels to soak as much of the liquid as you can.

How To Make Spinach Stuffed Portobello Mushrooms

How To Make Spinach Stuffed Portobello Mushrooms
How To Make Spinach Stuffed Portobello Mushrooms


  • 4 Portobello mushroom caps, stems removed, wiped clean
  • Olive oil cooking spray
  • 1 teaspoon kosher salt, divided
  • 1/4 teaspoon black pepper, divided
  • 10 oz frozen chopped spinach
  • 2 tablespoons olive oil, divided
  • 1 small onion, finely chopped (6oz)
  • 1 tablespoon minced garlic
  • 1/4 cup grated Parmesan


  • Preheat broiler, setting temperature to high. Set oven rack in the middle of the oven (you don’t want the mushrooms too close to the heat element for this recipe). Line a baking sheet with foil.
  • Spray the mushroom caps with olive oil cooking spray on both sides. Sprinkle with 1/2 teaspoon kosher salt and 1/8 teaspoon black pepper. Broil 5 minutes on each side, or until just tender.
  • Meanwhile, defrost spinach in the microwave according to the directions on the package (my package said to cut a small slit in the wrapper, place on a microwave-safe plate and microwave for 4-6 minutes). Place in a colander to drain. When cool enough to handle, press on the cooked spinach with your hands and extract as much water as possible out of it. Repeat this until you’re sure you can no longer extract more water.
  • Remove mushrooms from oven. Heat 1 tablespoon olive oil in a large skillet over medium heat, about 3 minutes. Add the onion and cook 5-7 minutes, stirring occasionally, until golden. Add the garlic, spinach, 1/2 teaspoon kosher salt and 1/8 teaspoon black pepper and cook, stirring to combine everything, 1-2 more minutes. Remove from heat and allow to cool a few minutes, then mix in the Parmesan.
  • Evenly distribute the spinach mixture among the mushrooms. Don’t press down on the filling – it’s prettier when it’s piled high on top of the mushrooms. Place back under the broiler for 2-3 minutes, or until filling is golden.

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