Louisiana Crawfish Ya-Ya Pasta

INGREDIENTS

• 3/4 (12 ounce) package egg noodles
• 1/2 cup butter
• 1/2 cup chopped onion
• 1/4 cup minced green bell pepper
• 1 clove garlic, minced
• 2 tablespoons chopped fresh parsley
• 1 (16 ounce) package cooked and peeled whole crawfish tails
• 2 tablespoons Cajun seasoning blend (such as Tony Chachere's®), or to taste
• 1/2 cup heavy cream
• 1/3 cup sliced fresh mushrooms (optional)
• 3/4 cup shredded Cheddar cheese, divided
• 1/3 cup sliced green onions