1 package (16 ounces) mini penne pasta
1/2 pound baby portobello mushrooms, chopped
1 small onion, finely chopped
2 tablespoons butter
1 tablespoon olive oil
1 garlic clove, minced
SAUCE:
5 tablespoons butter
1 package (8 ounces) cream cheese, cubed
1-1/4 cups whole milk
1-1/4 cups half-and-half cream
2-1/2 cups (10 ounces) shredded Swiss cheese
1-1/4 cups grated Parmesan and Romano cheese blend
1/4 teaspoon salt
1/4 teaspoon pepper
6 bacon strips, cooked and crumbled
TOPPING:
1/3 cup panko (Japanese) bread crumbs
2 tablespoons minced fresh parsley
2 tablespoons butter, melted