Add the oats, raisins and pumpkin pie spice to the carafe of a blender and pour in the milk, adding more to cover the oats if needed. Stir completely and set aside until the oats are soft, 15 minutes.
Blend on high speed until pureed and smooth, about 1 minute. Add the yoghurt, brown sugar and 1 1/2 cups ice, and blend on high speed until smooth, about 30 seconds. Pour into 2 pint glasses.
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Kids Warning: Note to parents: Never leave a child unattended in the kitchen. These recipes are appropriate for children of various ages, 4 to 10. When a recipe calls for cooking on the stove or using a paring knife, an adult should do those activities and let the child assist, if age appropriate.