Cook the frozen spinach according to the package directions. Drain it thoroughly, squeezing out as much liquid as possible.
In a large bowl, combine the cooked spinach, sour cream, and ranch seasoning. Stir until smooth and well combined.
Cover and refrigerate for at least 2 hours to allow the flavors to develop.
When ready to serve, cut the top off the round loaf of King's Hawaiian Bread. Hollow out the center, leaving about a 1-inch border to create a bread bowl.
Spoon the chilled spinach dip into the bread bowl. Cut the removed bread into bite-sized pieces and serve alongside the dip for dipping.
Notes
Squeeze the spinach very well so the dip stays thick and creamy.
Make the dip a day ahead for even better flavor.
Save every piece of bread for dipping. They're often the first to disappear.
Keep the dip chilled until you're ready to serve.
Serve with fresh vegetables, crackers, or pretzels in addition to the bread pieces.