Get a boost of protein with this simple 4-ingredient smoothie. With high protein content, this smoothie is a great post-workout drink.

Recipe Highlights
- This satisfying drink is made of oat milk, vanilla protein powder, chia seeds, and frozen bananas.
- Bananas are rich in fiber and antioxidants, making it ideal for smoothies.
- The recipe makes 16 ounces (2 cups) of banana protein smoothie.
RELATED: 17 Dairy-Free Smoothie Recipes
Ingredient Notes

- Oat milk: Use unsweetened and unflavored oat milk so you can better control the taste. Instead of oat milk, you can use dairy milk. It will add extra protein and calcium. For a dairy-free option that’s high in protein, use soy milk.
- Vanilla protein powder: Protein powder makes the smoothie thick and creamy. The vanilla flavor works well with bananas, but you can use unflavored or chocolate powders too.
- Chia seeds: Chia seeds have a thickening effect in drinks. They also have a mild nutty flavor.
- Frozen bananas: For the best flavor, use bananas with a yellow peel and some brown spots. This is a sign that the banana is ripe and sweet.
For full ingredients and detailed instructions, please see the recipe card at the bottom of the post.
Variations
Seeds: If you don’t have chia seeds, hemp seeds or flax seeds also work. Both ingredients have a nutty flavor, just like chia seeds. They contain protein, fiber, and anti-inflammatory omega-3 fats. Use 1 or 2 tablespoons per drink.
Nut butters: To deepen the flavor of your smoothie, add 1 or 2 tablespoons of nut butter. Tasty options include cashew butter, peanut butter, and almond butter. These ingredients have some protein, along with antioxidants and good fats.
Leafy greens: For even more nutrients, add a handful of leafy greens to the recipe. They’re high in antioxidants, fiber, vitamins, and minerals. Baby kale and spinach are great options. If you want to use the regular kind, be sure to cut off the stems.
Step-by-Step Instructions

Step 1: Pour oat milk into the blender. Add protein powder and chia seeds.
Start with liquid ingredients for the smoothest blend.

Step 2: Add frozen banana.

Step 3: Blend until smooth. Start on a low speed, then increase to high.

Step 4: Pour into a cup. Serve immediately.
Blender Tips
Before freezing fruits, cut them into chunks.
Adding a whole frozen banana to a blender can be dangerous. It can damage the blades and container.
Instead, cut the banana into coins before freezing it. Your blender will have an easier time pureeing the fruit. If you have a powerful blender, you can cut the banana into slightly bigger pieces, about the size of apple wedges.
Avoid loading ingredients randomly.
For a smooth and even blend, add ingredients from lightest to heaviest. The lighter ingredients include liquids and liquid sweeteners. Follow with add-ins, including powders and nut butters. Next load any leafy greens, followed by fresh fruit. Finish with ice or frozen fruit.
Blend on high for most of the time.
To keep your blender’s motor cool, don’t blend on low speed for too long. Start on low speed for about 10 seconds, enough to break down the ingredients. Then increase the speed to high for the time listed in the recipe.
Push ingredients down with a tamper.
Most blenders come with a tamper. To use it, put the tamper through the lid while the blades are moving.
As you rotate the tamper, it will push ingredients toward the blades, ensuring everything is pureed. The tamper has a stopper, so it won’t touch the blades.
Scrape out extra smoothie.
Another useful tool for making smoothies is a blade scraper. The tip is designed to reach under the blades, letting you remove leftover smoothie. It’s a simple way to prevent wasting smoothie.
Expert Tips
- If you prefer sweeter smoothies, add a chopped and pitted Medjool date.
- Make a thicker smoothie by adding extra frozen banana or a few ice cubes.
- To thin the smoothie, add a splash of oat milk and blend for 10 seconds to combine.
- Always check the protein powder’s packaging before using it in smoothies. Some brands recommend using more than 1 scoop per drink.
- Keep leftover smoothie in the refrigerator for up to 2 days. If the ingredients separate, mix the smoothie before drinking it.

Related
- How to Freeze Bananas Properly
- Peanut Butter Banana Protein Shake
- Peanut Butter Banana Smoothie
- Mocha Smoothie
- Chocolate Peanut Butter Banana Smoothie
- 17 Best Healthy Smoothie Recipes
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Banana Protein Smoothie
INGREDIENTS
- 1 cup oat milk
- 1 scoop vanilla protein powder
- 1 tablespoon chia seeds
- 1 ½ frozen bananas (sliced)
INSTRUCTIONS
- Put oat milk, vanilla protein powder, chia seeds, and frozen bananas into a blender. Secure lid.Place ingredients into the blender in the order listed.
- Blend until smooth.Start the blender on LOW speed for 10 seconds. Increase speed to HIGH for a full minute.
- Pour smoothie into a cup. Serve immediately.
EQUIPMENT
NOTES
- For the best flavor, use bananas with a yellow peel and some brown spots. This is a sign that the banana is ripe and sweet.
- If you prefer sweeter smoothies, add a chopped and pitted Medjool date.
- Make a thicker smoothie by adding extra frozen banana or a few ice cubes.
- To thin the smoothie, add a splash of oat milk and blend for 10 seconds to combine.
- Always check the protein powder’s packaging before using it in smoothies. Some brands recommend using more than 1 scoop per drink.
- Keep leftover smoothie in the refrigerator for up to 2 days. If the ingredients separate, mix the smoothie before drinking it.
