Instead of rounding up smoothie ingredients such as bananas, greens, and protein powder on the spot, Muffin Tin Mania's Matt Kadey recommends blending a batch ahead of time. Freeze the mixture in muffin tins and then store in a zip-top bag for later. When you're in the mood for a smoothie, you can quickly toss a couple of these frozen smoothie cups in a blender with liquid such as water, coconut water, or milk.
Matt says he prefers silicone muffin cups, which are easier to unmold. If you use metal pans, you might need to place the tray in warm water for a few seconds.
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(Images: Muffin Tin Mania)