Scoop out the avocado half. Chop the spinach leaves, if using fresh.
If using frozen spinach: place the spinach in a microwave safe bowl and microwave for one minute on high. If the spinach is not completely reheated, stir it and microwave again for 30 seconds.
Drain the spinach.
Arrange all ingredients in a food processor or immersion blender and blend everything until creamy and homogeneous.