- Preheat oven to 350 degrees 
- Heat oil in a large skillet over medium-high heat 
- Add mushroom stems, onions, bell pepper.salt and pepperĀ  
- Cook stirring occasionally until soft 
- Transfer to a large bowl, add spinach, mix well and set aside to cool 
- Arrange mushroom caps in a single layer on a parchment paper lined baking sheet 
- Add salt and pepper to spinach mixture, then divide filling evenly between mushroom, mounding it in the center of each 
- Drizzle lightly with remaining olive oil and bake until soft and juicy. Approx 20 minutes. 
- *Recipe and photo credits to ITG's Your Loss Your Gain in Illinois!