Wash spinach or kale thoroughly and pat dry.
Peel the banana and break it into chunks for easier blending.
Peel the kiwi and cut in half; if using pineapple, chop into small pieces.
Measure almond milk (or chosen liquid) and pour half into the blender.
Add the leafy greens on top of the liquid to help them blend more easily.
Add banana, kiwi (or pineapple), and Greek yogurt to the blender.
Sprinkle in chia or flaxseeds and add honey or maple syrup if extra sweetness is desired.
Add remaining liquid to reach a creamy consistency; start with less and add as needed.
Drop in 4–6 ice cubes if you prefer a chilled, frosty texture.
Secure the blender lid and blend on low, then increase to high for 30–60 seconds until smooth.
Stop and scrape down the sides with a spatula; blend again for 10–15 seconds to fully incorporate.
Check texture and sweetness; adjust with more liquid for thinner consistency or a touch more sweetener if desired. Pour into a glass and garnish with a kiwi slice or mint.