Making cheese and jalapeño stuffed mushrooms is a straightforward process. Follow these step-by-step instructions to create this delightful appetizer:

1. Preheat the oven: Begin by preheating your oven to 375°F (190°C).
2. Prepare the mushrooms: Carefully clean the mushrooms and remove the stems. Set the caps aside and finely chop the stems.
3. Make the filling: In a medium-sized bowl, combine the cream cheese, chopped jalapeños, minced garlic, chopped green onions, Parmesan cheese, chopped mushroom stems, salt, and black pepper. Mix until all ingredients are well incorporated.
4. Stuff the mushrooms: Using a spoon, fill each mushroom cap with the cream cheese mixture. Be generous with the filling, ensuring each cap is well-stuffed.
5. Top with breadcrumbs: In a small bowl, mix the breadcrumbs with olive oil. Sprinkle a small amount of the breadcrumb mixture on top of each stuffed mushroom.
6. Bake the mushrooms: Arrange the stuffed mushrooms in a baking dish, ensuring they are not overcrowded. Place the dish in the preheated oven and bake for 20-25 minutes, or until the mushrooms are tender and the tops are golden brown.
7. Garnish and serve: Remove the mushrooms from the oven and let them cool slightly. Garnish with fresh parsley before serving.