Melt 2 tablespoons butter in a large skillet over medium-high heat.
Sauté/stir onion, celery, green pepper, and parsley until vegetables are softened.
Add in thyme, salt, pepper, hot sauce, crayfish, and breadcrumbs; stir well until heated through; adjust seasoning to taste.
Spoon mixture into mushroom caps and place mushrooms in a baking dish.
Sprinkle with paprika and drizzle with 2 tablespoons melted butter.
Bake, uncovered, in a 350°F oven for 10-15 minutes.
