In a medium mixing bowl, combine the goat cheese (or softened cream cheese), sour cream (or mayo, or a combination of both), Dijon mustard, sriracha, onion powder and garlic powder. Mix with a whisk until well combined, smooth and creamy.
Add the crab meat, chopped shrimp, green onion, parsley and cheeses (save a handful of cheese to put on top of the dip) and mix delicately with a rubber spatula until well combined
Transfer the dip to an oven-safe dish, sprinkle with the reserved handful of grated cheese and bake for 30-35 minutes or until the cheese has melted and is bubbling on the sides and the top has turned golden brown.
Remove from the oven and allow to rest for 10 to 15 minutes before serving.
Garnish with a sprinkle of chopped parsley and a cooked shrimp, if desired and serve with sliced crusted bread, crackers or your favorite crudités.
*Be sure to really remove as much moisture as you can from the crab and shrimp meat or you might end up with a soupy dip. If you want to play it really safe, add a teaspoon of corn starch to the cheese mixture before whisking.