Preheat oven to 375 degrees Fahrenheit.
Prep the mushrooms by removing the stem, ensuring there is no mushroom left in the cap.
Heat a skillet over medium heat and add oil. Add the onions, shallots and garlic to the pan once it’s hot.
Cook for 2-3 minutes, until translucent and fragrant.
Add the chorizo (or sausage of choice) and cook for 5 – 7 minutes, until warm.
Once heated, remove from pan and add to a mixing bowl.
Add in the blue cheese, breadcrumbs and spinach to the mixture and mix thoroughly, until everything is combined.
Prep a baking tray with parchment paper and add the mushroom caps to the baking sheet, cap side down.
Scoop about ½ Tbsp to 1 Tbsp of the cheese mixture to the mushroom cap and continue until all of the mushrooms are filled. Sprinkle the top with some breadcrumbs.
Add to oven and cook for about 20 minutes, until the mushrooms are soft.
Remove from oven and serve garnished with chopped green onions.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.