01 -
Preheat the oven to 350°F (175°C) and grease a 10.5x7.5-inch or similar-sized casserole dish.
02 -
Thaw frozen spinach completely. Place spinach in the middle of a cheesecloth or towel and wring out all excess water.
03 -
Chop artichoke hearts into bite-sized pieces and thinly slice green onions.
04 -
In a large mixing bowl, whisk together softened cream cheese, sour cream, and Kewpie mayonnaise until smooth.
05 -
Add the chopped artichoke hearts, spinach, green onions, garlic powder, red pepper flakes (if using), grated Parmesan cheese, 3/4 cup grated mozzarella cheese, flaked crab meat, salt, and pepper. Mix gently to combine.
06 -
Transfer the mixture into the prepared casserole dish and spread evenly. Top with the remaining mozzarella cheese.
07 -
Bake for 20-25 minutes or until edges are lightly golden. Then broil for 2-5 minutes until the top is bubbly and golden brown. Keep an eye to avoid burning. Serve hot or warm.