Preheat your oven to 350 degrees F (175 degrees C).
In a large mixing bowl, combine the softened cream cheese, mayonnaise, shredded cheddar cheese, garlic powder, onion powder, hot sauce, salt, and black pepper.
Fold in the crawfish tails until everything is well mixed.
Transfer the mixture to an oven-safe baking dish.
Bake in the preheated oven for 20 minutes or until the dip is bubbly and slightly golden on top.
Remove from the oven and garnish with chopped green onions.
Serve warm with crackers or toasted bread slices.