Oat Milk Banana Smoothie | IDDSI Level 1 Slightly Thick Dairy-Free Breakfast

IDDSI Level 1 (Slightly Thick) | 10 minutes | Easy | Dairy-Free

This oat milk banana smoothie achieves IDDSI Level 1 (Slightly Thick) naturally — without commercial thickener — through the starch released from a ripe blended banana and the natural viscosity of oat milk. The result is a smooth, lightly viscous drink that flows more slowly than water but is not “thick” in the way of a full thickened beverage. IDDSI Level 1 is appropriate for patients who have been assessed as needing minimally thickened fluid — always follow the speech-language pathologist’s specific IDDSI prescription.

The smoothie is designed as a breakfast option: naturally sweet, gently energising, and easy to prepare in under 10 minutes.

Ingredients (1 serving)

Main:

• 150ml unsweetened oat milk (barista or standard; avoid “light” versions which are more watery)
• 1 small ripe banana (approximately 100g; very ripe, with brown spots, gives better natural thickening and sweetness)
• 1/2 teaspoon vanilla extract (optional)
• Pinch of cinnamon (optional)

Optional fortification for calorie density:

• 1 tablespoon smooth almond butter or peanut butter (100% nuts, no lumps — adds protein and 90 kcal)
• 1 tablespoon rolled oats, blended very fine (adds texture and approximately 40 kcal)
• 1 tablespoon honey or maple syrup (adds sweetness if banana alone is not sweet enough)

Method

1. Peel the banana; if frozen banana is available (pre-sliced and frozen overnight), use frozen for a thicker result.
2. Place the banana, oat milk, vanilla extract (if using), cinnamon (if using), and any optional fortifications into a blender.
3. Blend on high speed for at least 30 seconds until completely smooth — no banana chunks or lumps remain.
4. Pour through a fine strainer once if you want maximum smoothness (optional but recommended for strict Level 1).
5. Perform the IDDSI syringe flow test (see below) to confirm Level 1 consistency.
6. Serve immediately in a cup or glass with a wide straw (or small spoon). Do not allow to sit — the banana starch will continue to thicken as it sits.

Texture Test

IDDSI Level 1 (Slightly Thick) syringe flow test:

• Fill a 10ml syringe with the smoothie; hold upright for 10 seconds
• Release the plunger (do not push)
• Measure the volume that flows out in 10 seconds
• Level 1 = 1–9ml flows out in 10 seconds
• Level 0 (too thin) = 10ml flows in under 10 seconds (treat as thin liquid — check with SLP)
• Level 2 (too thick) = less than 1ml flows in 10 seconds (in this case, thin with a little more oat milk)

Adjustment:

• To thin: add 20–30ml extra oat milk and blend again; re-test
• To thicken: add half a teaspoon of commercial xanthan gum thickener and blend; re-test

Safety Notes

⚠️ IDDSI level confirmation: This smoothie should naturally achieve Level 1 with a very ripe banana. However, banana ripeness and oat milk brand affect the result. Always test before serving.

⚠️ Straws: Wide-bore smoothie straws are preferable to narrow coffee straws. For patients with significant oral motor weakness, a teaspoon or small cup may be safer than a straw — confirm with the SLP.

⚠️ Nut butter: If using nut butter, ensure it is completely smooth (no lumps). Run it through the blender with the smoothie; do not stir in separately as it may not incorporate evenly.

⚠️ Banana allergy: Banana allergy is uncommon but exists. For banana-free Level 1 smoothies, use 1/2 avocado (adds natural thickness) or 1 tablespoon of cooked rolled oats blended smooth.

Sourcing Outside Hong Kong

For international care kitchens and home cooks outside Hong Kong, Cantonese ingredients are widely available at East and Southeast Asian grocery stores:

• United Kingdom: Wing Yip (Birmingham, London, Manchester), See Woo (London), Loon Fung (London)
• United States: 99 Ranch Market (West Coast), H Mart (East Coast), local Chinatown grocers
• Canada: T&T Supermarket (national chain), local Asian markets
• Australia: Burlington Supermarket, Tang’s, local Chinese grocers in Chinatown precincts
• Singapore & Malaysia: Sheng Siong, NTUC FairPrice (Singapore); Tesco, Mydin (Malaysia)
• Online: Sous Chef (UK/EU), Amazon.com (US), Yami.com (US)

Oat milk: universally available at mainstream supermarkets (Oatly, Alpro Oat).

If a specific ingredient is unavailable in your region, the recipe notes alternative substitutions in the Ingredients section. For dishes requiring fresh Cantonese-specific ingredients (e.g. preserved century egg, fresh rice noodle rolls), check with your local East Asian grocer before substituting — texture compliance for IDDSI levels may require specific products.

Nutrition

Approximately 200 kcal (without fortification), 3–4g protein, 40g carbohydrate, 3g fat. With smooth peanut butter: approximately 290 kcal, 7g protein. Oat milk contributes beta-glucan (a soluble fibre associated with cholesterol reduction and cardiovascular health), and in fortified versions provides B vitamins and calcium. Banana provides potassium, vitamin B6, and natural sugars for immediate energy. This combination makes the smoothie a nutritionally decent breakfast option for patients who cannot manage solid food in the morning.

Variation: Mango Version

For patients who prefer a tropical flavour, substitute the banana with 80g frozen mango purée (ensure no fibres remain — strain after blending). Frozen mango purée is available at City’super and selected supermarkets in the frozen section. Mango achieves a slightly less thick result than banana — adjust with a small amount of commercial thickener if the IDDSI test shows Level 0.