Prepare Ingredients by washing and coring apples, then chop them. Gather unsweetened milk, vanilla Greek yogurt, apple pie spice or cinnamon, and ice cubes for blending.

In a high-speed blender, combine chopped apples, 1.5 cups unsweetened milk, 0.5 cups vanilla Greek yogurt, 1 teaspoon apple pie spice or cinnamon, and 0.5 cups ice cubes. Blend on high for 30-45 seconds until smooth.

Taste and adjust sweetness. If desired, add 1 teaspoon maple syrup or honey and blend for another 10-15 seconds.

Once the smoothie is ready, pour it into two tall glasses and garnish with whipped cream, apple slices, ground cinnamon, or a cinnamon stick.