I found this receipt just now - sounds pretty decent to me. ; ) Of course, as with any smoothie one can add or deduct things accordingly - add more fruits , or add protein powder, or some monk fruit to sweeten it up : )))

½ cup (90 grams) broccoli florets fresh or frozen
1 apple
½ cup (50 grams) blueberries frozen
2 bananas frozen
1 cup (250 ml) almond milk
½ cup (125 ml) water
2 teaspoons chia seeds

Instructions

In a high speed blender, blend all of the ingredients together until smooth. Serve immediately.

Frozen berries have similar nutritional value as fresh berries, if not more. That is because berries are at their prime and retain their nutrients better at the moment of the flash-freezing process. Therefore, for this recipe, you can use pre-packed frozen berries or berries that you have stocked up on fresh and frozen them yourself.
Same goes for broccoli. You can use fresh or frozen broccoli florets.
Broccoli can be substituted by spinach.
Almond milk – naturally adds a hint of sweetness to the smoothie. Alternatively, you can use rice milk, soy milk, cashew milk, or coconut milk.
Remember to always mix chia seeds into another food and avoid intaking it dry, as this might cause swallowing problems (chia seeds can absorb water up to 27 times their weight which could cause a problem swallowing them in their dry form).
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Disclosure - did not try it yet, but it sounds very drinkable : ))