Preheat the oven: Set to 375°F (190°C) and line a baking tray with parchment paper.
Prepare the mushrooms: Clean the mushrooms and remove the stems. Use a spoon to gently scoop out the gills to make room for the filling.
Cook the chorizo: In a pan over medium heat, cook the crumbled chorizo until browned and crispy. Drain excess fat if necessary.
Make the filling: In a bowl, combine the cooked chorizo, cream cheese, mozzarella or Parmesan, garlic, parsley, paprika, chili flakes, salt, and pepper. Mix until well combined.
Stuff the mushrooms: Spoon the chorizo mixture into each mushroom cap, pressing down gently to pack it in.
Bake: Arrange the stuffed mushrooms on the prepared baking tray. Brush the mushroom caps with olive oil to help them crisp up. Bake for 15-20 minutes or until the mushrooms are tender and the filling is golden.
Serve: Garnish with extra parsley and enjoy warm as a delicious appetizer.
Notes
For extra flavor, try adding a squeeze of lime juice or a drizzle of hot sauce before serving.
If you're making these in advance, you can prep the stuffed mushrooms and store them in the fridge until you're ready to bake them.