Add the mixed berries, Greek yogurt, and maple syrup to a blender.
Blend until mostly smooth. For a little texture, blend briefly and leave some small pieces of berries in the mixture.
Pour the mixture into the popsicle molds, leaving a little space at the top for expansion.
Insert the popsicle sticks and freeze for 4 to 5 hours, or until completely solid.
Notes
A thick plain Greek yogurt works best for a creamy texture. If using frozen berries, allow them to soften slightly before blending so the mixture blends evenly.