In a large mixing bowl, combine cream cheese, sour cream, mayonnaise, ¾ cup cheese, the white and light green parts of the green onions, tamari, sesame oil, Sriracha, and garlic powder. Stir until fully combined. Stir in the crab meat.
Transfer the mixture to a 9-inch baking dish. Top with the remaining cheese. Bake for 20-25 minutes or until bubbly and golden. Top with the dark green parts of the green onion and serve with crackers.