Yes, this can be made in a blender. However, as no liquid is used, a high speed blender is needed to combine the ingredients together and create a smooth texture. Using a regular cheaper blender would require liquid to be added to help turn the blade which would cause the smoothie bowl to lose its thick consistency. The best high speed blenders are:-  - Vitamix (UK Link/US Link) or - BlendTec (UK Link/US Link). You still may have to stop the blender every 30 seconds and push the ingredients down with a wooden spoon to allow the ingredients to be fully combined.