Step 1: Prepare the Green Power Layer

First, we create the foundation of our smoothie. The green layer needs to be thick and smooth to support the berry layer on top.

1. Combine Ingredients: In the carafe of a high-speed blender, add all the ingredients for the Green Power Layer: the packed spinach, frozen banana slices, frozen pineapple chunks, the piece of avocado, chia seeds, and ½ cup of almond milk.
2. Blend to Perfection: Secure the lid and start the blender on a low setting. Gradually increase the speed to high. Blend for 60-90 seconds, or until the mixture is completely smooth, creamy, and free of any leafy specks. If the blender is struggling, you can add another tablespoon of milk, but be careful not to make it too thin. The consistency should be thick, like a soft-serve ice cream.
3. Pour the Base: Evenly divide this vibrant green mixture between two tall, clear serving glasses. Fill each glass about halfway. Use a spatula to smooth the top surface if you wish.

Step 2: Prepare the Mixed-Berry Layer

Now for the jewel-toned top layer. It’s crucial to rinse your blender carafe quickly between layers to prevent the colors from mixing.

1. Rinse Blender: Give your blender a quick rinse with water to remove any residual green smoothie. This ensures your berry layer stays a beautiful, vibrant purple-red.
2. Combine Ingredients: Add all the ingredients for the Mixed-Berry Layer to the clean blender: the frozen mixed berries, Greek yogurt, and just ¼ cup of almond milk to start. Add the optional sweetener now if you’re using it.
3. Blend Carefully: Again, start the blender on low and increase to high. This layer is often thicker due to the high volume of frozen fruit. You may need to stop and scrape down the sides with a spatula. If it’s too thick to blend, add the remaining ¼ cup of milk one tablespoon at a time until it reaches a thick but pourable consistency. The goal is for it to be slightly less dense or of similar density to the green layer.
4. The Layering Technique: This is the most important part for achieving that beautiful, distinct look. Take a large spoon and hold it just above the surface of the green layer in one of the glasses. Slowly and gently pour the berry smoothie over the back of the spoon. This disperses the smoothie, preventing it from plunging into and mixing with the green layer. Continue pouring slowly until the glass is full. Repeat with the second glass.

Step 3: Garnish and Serve Immediately

The final flourish makes all the difference. Garnish your beautiful layered smoothies with a few fresh berries, a sprinkle of granola, or a mint sprig before serving immediately.