The first time we handed our daughter a green smoothie, she looked at it the way you might look at a glass of pond water. Suspicious. Slightly horrified. Absolutely not drinking it.
We had made every mistake in the book. It was too leafy, too thin, and there were tiny flecks of spinach floating on top like evidence at a crime scene.
So we went back to the drawing board. After a lot of experimenting (and a lot of smoothies drunk by grown-ups), we landed on this Green Monster Smoothie.
It is thick, creamy and tastes like a tropical holiday, thanks to mango and banana. The spinach is completely smooth and invisible except for the colour. And the colour, it turns out, is exactly what kids love once you give it the right name.
Today it is one of the most requested drinks in our house. A monster smoothie, a monster straw, and a very happy little monster.
The Science of a Smoothie Kids Will Drink
Getting children to enjoy a green smoothie comes down to three things: flavour, texture and story.
Flavour. Spinach is the best green for beginners because its taste is incredibly mild. Paired with sweet, fragrant fruits like ripe banana and mango, it simply disappears. Kale and other bitter greens are better saved for later.
Texture. Children are very sensitive to texture. A thin, watery smoothie or one with bits of leaf in it will be rejected fast. Frozen fruit and a little avocado make this smoothie thick and velvety, almost like a milkshake.
Story. Calling it a “green smoothie” sounds like medicine. Calling it a “monster smoothie” makes it an adventure. Never underestimate the power of a good name.
Why Avocado?
It might seem like a strange addition, but a quarter of an avocado is our secret to an ultra-creamy texture.
Avocado has a very neutral flavour once blended, so nobody will taste it. What it adds is richness, healthy fats and a silky smoothness that makes the drink feel indulgent. Those fats also help children feel full for longer, which makes this smoothie a more balanced snack.
Step-by-Step Instructions
Order is everything with green smoothies. Follow these steps and you will never see a green fleck again.
What You Need (Ingredients) (serves 2)
Tap to check off as you cook!
Step 1: Blend the Greens First
Pour the milk into the blender and add the spinach. Blend on high for 30 seconds, until the spinach has completely dissolved into a bright green liquid.
This step is the whole secret. Blending the leaves with liquid alone, before the thick ingredients go in, breaks them down completely.
Step 2: Add the Fruit and Avocado
Add the frozen banana, frozen mango chunks and avocado. If you like a little zing, add a squeeze of lime juice, which brightens the flavour and the colour.
Step 3: Blend Until Thick
Blend on high for another 45 to 60 seconds, until thick, smooth and creamy. If it is too thick, add a splash more milk. If it is too thin, add a few more frozen mango chunks.
Step 4: Serve the Monster
Pour into glasses and serve straight away. Green smoothies taste best fresh, and the colour can dull if they sit around.
A few fun ideas: draw monster eyes on a clear cup with a washable marker, add a colourful straw, or serve it in a bowl with sliced banana “teeth” on top.
Monster Variations
- Pineapple monster: Swap mango for frozen pineapple for a sharper, tangier flavour.
- Chocolate monster: Add one teaspoon of cocoa powder. It turns the smoothie brown, but it tastes like a chocolate milkshake.
- Protein monster: Add two tablespoons of Greek yogurt or a spoonful of nut butter (if there are no allergies).
- Oaty monster: Blend in two tablespoons of rolled oats to make it more filling for breakfast.
- Ice pop monster: Pour any leftovers into ice lolly moulds and freeze for a healthy summer treat.
Introducing Green Smoothies to Picky Eaters
If your child is very cautious, take it slowly. Start with just a small handful of spinach and plenty of mango. As they get used to the taste, gradually increase the spinach over a few weeks.
Let them press the blender button and watch the leaves vanish. Children who see the “magic trick” happen are often much more willing to try the result.
Make one for yourself too. Kids copy what they see. If a grown-up is happily drinking a green smoothie, it instantly becomes less suspicious.
And if they do not like it the first time, that is completely fine. Try again in a week or two with a different name, a different cup or a different fruit. Repeated, pressure-free exposure is how children learn to like new foods.
Frequently Asked Questions
Can I use kale instead of spinach?
You can, but kale has a stronger, slightly bitter taste and a tougher texture. Remove the stems and start with half the amount. Spinach is the better choice for first-time green smoothie drinkers.
Why does my green smoothie taste grassy?
Usually there is too much spinach for the amount of fruit, or the banana was not ripe enough. Use a banana with brown spots for maximum sweetness, and increase the mango to balance the greens.
Can I skip the avocado?
Yes. The smoothie will be a little thinner and less creamy. Replace it with two tablespoons of yogurt or an extra half banana to keep the texture thick.
How do I store leftovers?
Green smoothies are best drunk straight away. Leftovers can be kept in a sealed jar in the fridge for up to 24 hours, but they may separate and darken. Give them a good shake, or freeze them into ice pops instead.
A Few Practical Notes
Babies over six months can enjoy a little green smoothie from an open cup or as a spoonable purée. Use whole milk for children over one, and keep cow’s milk as an ingredient rather than a main drink for babies under one.
Like all fruit smoothies, this contains natural fruit sugars, so it is best enjoyed with a meal or as part of a snack rather than sipped slowly throughout the day.
Make it once, give it a monstrous name, and see what happens. You might just find you have a green-smoothie fan on your hands.
Yara's Pro Tip!
Blend the spinach with the milk first, before adding anything else. It is the single trick that gets rid of every green fleck and makes the texture silky instead of leafy.
