Homemade Oat Peanut Butter Banana Mass Gainer
By the QuiteRecipes team (Jamy & Kaïna) | Food Service Professional, Early Childhood Expert & Parents
A 790-calorie homemade mass gainer smoothie blending oats, peanut butter, banana, whole milk and whey for serious muscle growth.
A 790-calorie homemade mass gainer smoothie blending oats, peanut butter, banana, whole milk and whey for serious muscle growth.
🥄 Ingredients
- 🫗 2 cups (500ml) whole milk
- 🫗 1/2 cup (50g) rolled oats
- 🫗 2 tablespoons (32g) peanut butter
- 🫗 1 large ripe banana
- 🫗 1 scoop (35g) chocolate whey protein powder
- 🫗 1 tablespoon (15g) honey
- 🫗 1/4 teaspoon ground cinnamon
- 🫗 1/2 cup (120g) plain Greek yogurt
Nutrition Facts*
*Nutritional information is an estimate and may vary based on ingredients, brands and portion sizes. Values are provided per serving.
👨🍳 Instructions
Add the milk and oats to a blender and pulse for 20 seconds so the oats break down.
Add the banana, peanut butter, Greek yogurt, honey, cinnamon and whey protein.
Blend on high for 45-60 seconds until completely smooth and frothy.
Taste and adjust: add more milk to thin it out or more honey for sweetness.
Pour into a large glass and drink immediately for best texture.
⚠️ Common Mistakes
- ✕
Adding the whey last on top of the powder, which forms clumps against the blender lid.
- ✕
Using too much liquid, which turns the gainer into a watery drink that's hard to finish.
- ✕
Skipping a healthy fat source, leaving the shake too low in calories for a real mass gain.
🔄 Variations
Swap chocolate whey for vanilla or strawberry whey protein.
Replace peanut butter with almond butter or hazelnut butter.
Add 1 tablespoon of cocoa powder and a handful of ice for a chocolate frosty version.
🧊 Storage
- 📦
Best enjoyed fresh; the oats thicken as they sit.
- 📦
Store in the fridge for up to 12 hours in a sealed jar and shake well before drinking.
💡 Chef Tips
Tip 1: Blend the oats into a flour first so the shake has no gritty texture.
Tip 2: Use a frozen banana for a thicker, milkshake-like consistency.
Tip 3: Add a tablespoon of olive oil or flaxseed for an extra 120 calories without changing the flavor.
Tip 4: Toast the oats briefly in a dry pan for a subtle nutty flavor.
❓ FAQ
When should I drink this mass gainer? Anytime you need extra calories; it works well post-workout, as a meal replacement or before bed for a slow-digesting surplus.
Can I use water instead of milk? Yes, but you will lose about 150 calories and the shake becomes much thinner.
How much protein does it contain? Roughly 42g per serving, and you can push it past 55g by adding a second scoop of whey or extra Greek yogurt.
Is this a complete meal? It covers carbs, fats and protein well, but add fruit or greens to boost micronutrients if you rely on it often.
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About the Authors
This recipe and guide was developed, tested, and approved in our home kitchen and daily life. Jamy is a retired Food Service District Manager and Early Childhood Program Manager who spent his career overseeing multi-site restaurant operations, large-scale culinary production, and daycare menu management. Kaïna brings the ultimate real-world test: making sure it brings ease and joy to our kids on a busy weeknight.
Read more about our professional background and philosophy →