In a medium bowl, combine the dry spinach, cream cheese, sour cream, mayonnaise, 1/2 cup of the mozzarella cheese, Parmesan cheese, garlic, salt, and pepper. Mix well.
Spread the spinach mixture into a small baking dish. Sprinkle the remaining 1/2 cup of mozzarella cheese on top.
Bake for 20 to 25 minutes, or until the dip is hot and the cheese is melted and bubbly.
While the dip bakes, prepare the pita crisps. Cut each pita bread into 8 wedges.
Brush both sides of the pita wedges lightly with olive oil.
Arrange the wedges on a baking sheet in a single layer.
Bake for 8 to 10 minutes, flipping halfway through, until golden brown and crisp.
Serve the hot dip immediately with the fresh pita crisps.
Notes
Squeeze as much liquid out of the thawed spinach as you can for the best texture.
You can make the pita crisps ahead of time and store them in an airtight container.
For extra flavor, add a pinch of nutmeg to the dip mixture.