I use the Bella Cucina Rocket Blender to make my smoothies.
four big spoonfuls of greek yogurt, maybe 1/2–1 cup?
two big spoonfuls of almond butter, maybe 2 tablespoons–1/4 cup?
enough water to cover the cherries
Put enough frozen cherries to half fill the blender cup, then the greek yogurt, then the almond butter, and then water. Screw on the cap, stick the cup on the motor base, and blend for 30 seconds. Then take it off the base and give it a little shake to get anything that's stuck on the top of the cup. Blend for another 20 seconds or until the smoothie is churning freely from top to bottom.