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Cassandra Curtis has made more smoothies than she can count. As Once Upon a Farm's Co-founder and resident smoothie expert, she knows exactly what separates a great blend from a mediocre one. She's sharing her full playbook, along with a printable cheat sheet for your fridge.
The Core Elements of a Perfect Smoothie
Building a great smoothie is all about balance—great flavor, plenty of nutrition, a vibrant color, and a creamy texture. "The best smoothies don't just taste 'healthy,'" says Cassandra, "they taste delicious while delivering real nutritional value."
How To Achieve the Ideal Smoothie Texture
To achieve that creamy texture, it helps to start with a simple formula. Cassandra recommends:
- 1 cup liquid (oat milk, almond milk, dairy milk, water, etc.)
- 1 cup frozen fruit and/or vegetables
- ½ cup fresh produce
- 1 serving protein (Greek yogurt, protein powder, nut butter, etc.)
- 1 tablespoon dietary fat (chia seeds, flax seed, avocado, coconut, or nut butter)
Once Upon a Farm Co-founder and Chief Innovation Officer, Cassandra Curtis
Choosing Your Smoothie's Liquid Base
The best liquid depends on what you're looking for. Milk or plant-based milk adds creaminess and extra nutrition, while coconut water is a great option if hydration is your priority. Water keeps things light and refreshing, and yogurt adds protein, probiotics, and an extra-thick texture.
"Start with about one cup of liquid per serving," Cassandra advises. "You can always add more, but it's much harder to fix a smoothie that's too thin."
Best Fruits for Blending
Some fruits naturally create a smooth, creamy consistency. Cassandra's favorites include bananas, mangoes, peaches, and avocado, all of which blend beautifully and add richness without overpowering the flavor.
A few fruits can be a little trickier. Apples and pears can taste gritty if they aren't blended thoroughly, while pineapple can leave behind fibrous pieces, and blackberries and raspberries are delicious, but their seeds may create a slightly grainier texture.
Best Veggies for Smoothies
Vegetables are one of the easiest ways to boost the nutritional value of a smoothie without changing the flavor too much. Cassandra recommends starting with mild vegetables that blend smoothly and let the fruit shine. Spinach, baby kale, cauliflower, zucchini, cooked sweet potato, cucumber, and carrots are all great options.
Some vegetables need a lighter touch. Raw broccoli, Brussels sprouts, beets, and stronger greens like mustard greens can quickly take over the flavor. "These vegetables can add bitterness or earthy flavors pretty quickly," she says. "A small amount can work well, but balance is key."
Use These Ingredients Sparingly
Some ingredients pack a lot of flavor, so a little goes a long way. Fresh ginger, turmeric, spirulina, matcha, mint, raw cacao, nutmeg, and clove can all add depth, but they're best added gradually. "It's always easier to add more than it is to take it away," Cassandra says.
Free Printable Smoothie-Making Guide
Download and print out our free guide to keep on your fridge for smoother blending!
Printing Instructions:
- Click this link to download PDF file.
- Print the file in color or black and white.
Frozen vs. Fresh: Does It Matter?
Both frozen and fresh ingredients deserve a place in your smoothie recipes. Using a combination of both gives you the best balance of freshness and creaminess.
Frozen: Bananas, mangoes, berries, peaches, pineapple, and even cauliflower are ideal because they create a thick, frosty texture without relying on ice, which can water down flavor.
Fresh: Leafy greens, herbs, citrus, cucumber, and avocado work best, as brightness and texture matter most.
Prep These Before Blending
Most smoothie ingredients are low-maintenance. Berries, spinach, baby kale, cucumbers, and zucchini can usually go straight into the blender.
A few fruits require a little prep first:
- Remove the peel from citrus, the pit from mangoes and avocados, and the skin and core from pineapple.
- Apples, pears, and peaches can often be blended with their skins after removing the pits or seeds. While the skin creates a slightly more fibrous texture, it contains prebiotic fiber, so it's worth keeping!
How to Use Protein Powders and Functional Add-Ins
Protein powders, greens powders, and other functional add-ins can boost nutrition, but more isn't always better. Cassandra recommends starting with about half of the suggested serving, then tasting before adding more.
Stronger-flavored powders tend to pair well with naturally sweet fruits like bananas and mangoes. If your protein powder is already sweetened, consider using fruits that are a little less sweet to keep everything balanced.
"Think of these ingredients as supporting players," she says, "not the whole smoothie."
Pro Tips
- Skip the ice. Frozen fruit chills while adding flavor.
- Start with less liquid. It’s easier to thin out a smoothie than to thicken it.
- Taste and adjust. Before adding, find out what you’re working with.
- Balance out sweetness. Very ripe fruit + juice + sweetened protein powder = an overly sweet smoothie.
- Go easy on the greens. Too much can lead to a bitter, earthy smoothie.
Texture Not Quite Right?
Don't fret! Your smoothie can still be rescued.
- Too Thick: Add a few tablespoons of liquid until you reach your desired consistency.
- Too Thin: Add frozen banana, mango, or cauliflower. Greek yogurt or soaked chia seeds can help, too.
- Too Grainy: Blend longer, or add a creamy ingredient like banana, avocado, or yogurt.
