Preheat your oven to 375°F (190°C).
Ensure the frozen spinach is completely thawed and squeezed very dry using a kitchen towel to remove all excess moisture.
In a medium mixing bowl, combine the cooked shredded chicken breast, non-fat Greek yogurt, chopped artichoke hearts, squeezed spinach, minced garlic, onion powder, lemon juice, sea salt, black pepper, and grated parmesan cheese.
Stir the mixture until well combined and transfer it into a small oven-safe ramekin or baking dish.
Sprinkle the shredded mozzarella cheese evenly over the top of the mixture.
Place the dish in the oven and bake for 15 to 20 minutes, or until the dip is heated through and the cheese on top is bubbly and lightly golden.
While the dip bakes, slice the whole wheat pita into six triangles.
Place the pita triangles on a baking sheet and toast them in the oven during the last 5 minutes of the dip's cooking time until they are warm and slightly crisp.
Remove from the oven and serve the hot dip immediately with the toasted pita triangles.