Line baking sheet with parchment paper. Coat with olive oil spray.
Using spoon, scrape out dark gills from mushrooms; discard gills.
Place mushrooms stem-side up and top each with 2 tablespoons sauce. Sprinkle each with 2 tablespoons mozzarella cheese and four slices pepperoni or chorizo.
Bake 20-25 minutes, until cheese is bubbly and mushrooms are soft.
We provide nutritional information but these figures should be considered estimates as they are not calculated by a registered dietitian. Please consult a medical professional for any specific nutrition, diet, or allergy advice.