Gather all ingredients and measure them into separate bowls or directly into the blender. If using fresh blueberries, rinse and pat dry; if frozen, no prep needed (30 seconds).

Add 1.5 cups blueberries to the blender jar first, followed by 1 peeled and sliced ripe banana. Layer these at the bottom so they blend smoothly (1 minute).

Add 1 cup plain Greek yogurt on top of the fruit. Pour 1 cup unsweetened almond milk slowly over the yogurt to ensure even blending (2 minutes).

Add 2 tablespoons raw honey, 1 tablespoon ground flaxseed, 1 teaspoon vanilla extract, 1/2 teaspoon ground cinnamon, and a small pinch of sea salt directly into the blender (1 minute).

Add 1/2 cup ice cubes to the blender. Place the lid securely on top of the blender jar (1 minute).

Turn on the blender to high speed. Blend for 60 to 90 seconds without stopping. At the 30-second mark, check if the mixture is moving and blending evenly. If not, stop the blender, use a silicone spatula to stir from the bottom, replace the lid, and continue blending until smooth (90 seconds total). Checkpoint: The smoothie should be completely smooth with no visible chunks of fruit or ice, and should pour easily but coat the back of a spoon when you dip one in.

Remove the blender lid carefully, angling it away from your face so steam escapes safely. Taste the smoothie by pouring a small amount into a spoon (30 seconds).

Check the thickness and flavor: if the smoothie is too thick and hard to drink through a straw, add 2 to 3 tablespoons more almond milk and blend for 15 seconds more. If it's too thin, add 1/4 cup more frozen blueberries or 5 to 6 more ice cubes and blend for 20 seconds more (2 minutes).

If the smoothie is not sweet enough, add 1 more tablespoon of honey, blend briefly for 10 seconds, and taste again. Repeat if needed, adding honey 1 tablespoon at a time (2 minutes per adjustment).

Pour the blended smoothie into two tall 12-ounce glasses or three 8-ounce glasses immediately while it is still cold and frothy (1 minute).

Optional: Top each glass with a few fresh blueberries, a sprinkle of ground cinnamon, a thin slice of banana, or 1 tablespoon of granola for added texture and visual appeal (1 minute).

Serve immediately with a wide straw or spoon. Drink within 5 minutes for the best flavor, texture, and nutritional benefit. The smoothie will begin to separate if left sitting, though you can give it a quick stir before finishing (5 minutes maximum).