Easy Peanut Butter Banana Oatmeal Smoothie made with peanut butter, banana, rolled oats, milk, and chocolate protein powder (or cocoa powder). This no-added-sugar smoothie is my 15-year-old son’s go-to creation—he developed the recipe himself and it’s now a family favorite.
Although this is my first smoothie post that uses protein powder, I know many people prefer it for convenience and extra protein. My son added rolled oats to his blends and perfected this version using his favorite chocolate protein powder. After a family taste test, it earned our seal of approval.
He’s been making this as an after-school snack for weeks, so I wanted to share the recipe for anyone looking for a quick, filling smoothie without added sweeteners.
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Why You’ll Love This Recipe
- Quick and Easy: Just five ingredients and a blender—ready in minutes.
- Simple Pantry Ingredients: All five items are common grocery-store staples.
- No Added Sugar: Naturally sweet from banana and protein powder; no honey or maple syrup needed unless you choose unsweetened cocoa or a protein powder without sweetener.
- Kid-Approved: Created by a teenager and enjoyed by the whole family.
- High in Protein: About 30 grams of protein per 15-ounce serving (varies by protein powder).
Dietitian Tip
I avoid calling smoothies “meal replacements.” If you drink a smoothie for a meal, it’s your meal. Smoothies can be an efficient way to boost nutrient intake when you need something quick and portable.
This recipe provides nearly 500 calories, about 30 grams of protein, and 7 grams of fiber, making it a satisfying option for busy mornings or a hearty after-school snack—especially for teens with higher calorie needs.
Ingredient Notes
- Rolled Oats: Old-fashioned oats provide soluble fiber, potassium, and some protein. Quick oats work in a pinch; do not use steel-cut oats.
- Banana: Adds sweetness and creaminess. Use ripe fresh or frozen banana; the riper the fruit, the sweeter the smoothie.
- Peanut Butter: All-natural creamy peanut butter (peanuts ± salt) gives healthy monounsaturated fats and flavor.
- Chocolate Protein Powder: Blends easily and adds sweetness. If you skip protein powder, substitute 1½ tablespoons cocoa powder plus 3 tablespoons maple syrup (this increases calories and lowers protein).
- Milk: Skim or 2% are used here; cow’s or soy milk gives the most protein. Coconut or oat milk will change calories and protein content—choose based on your goals.
How to Make This Peanut Butter Banana Oatmeal Smoothie
- Place the rolled oats in the blender and pulse for a few seconds to break them down.
- Add the remaining ingredients and blend until smooth. Serve immediately and enjoy.
Helpful Tips
- Do not use steel-cut oats; they won’t blend smoothly.
- Blending the oats first yields a smoother drink. If you skip that step, some partially blended oats may settle at the bottom.
- No protein powder? Use 1½ tablespoons cocoa powder and 3 tablespoons maple syrup for a similar chocolate flavor (fewer grams of protein and more calories).
- The full recipe makes one 26-ounce smoothie or two 13-ounce servings. Adjust portions to suit your appetite.
- For an extra-cold smoothie, use a frozen banana or add a few ice cubes before blending.
- Swapping milk types significantly changes nutrition: skim vs whole milk changes calories by roughly 70 kcal, and using coconut milk adds many more calories while lowering protein.
- To boost calories and creaminess, add half an avocado (about +150 calories total, +75 calories per serving).
- If you prefer sweeter, add a small amount of maple syrup or a pitted date for natural sweetness.
Questions You May Have
Yes—raw rolled oats can be used in smoothies. For the best texture, blend the oats alone briefly before adding other ingredients. If you’re concerned about phytic acid, soak and drain the oats first.
Strawberries are a good swap. Frozen mango also works, but for this flavor profile frozen strawberries are my preferred substitute.
Soaking is optional. I usually skip it to save time. If you worry about phytic acid or prefer a softer texture, soak and drain the oats before blending.
Yes. Blend the oats first, then use a frozen banana and less milk to thicken. Top with banana slices, chia seeds, a drizzle of peanut butter, granola, and mini chocolate chips.
Related Recipes
- Strawberry Peanut Butter Smoothie
- Smoothie with Banana and Carrot
- Smoothie with Watermelon and Banana
- Strawberry Banana Smoothie Bowl
More Smoothie Recipes
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Delicious Dragon Fruit Smoothie
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Mango Pineapple Fruit Smoothie
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Creamy Blueberry Mango Tofu Smoothie
-
Island Green Tropical Smoothie
Did you make this peanut butter banana oatmeal smoothie and love it? Please leave a ⭐⭐⭐⭐⭐ rating and a comment below—feedback is the best compliment!
📖 Recipe
Peanut Butter Banana Oatmeal Smoothie
Kristi
Equipment
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1 Blender
Ingredients
- ¼ cup peanut butter all-natural peanut butter (just peanuts, with or without salt)
- ½ cup rolled oats
- 1 banana
- 2¼ cup milk skim, 2%, or whole milk
- 1 scoop chocolate protein powder to make this without protein powder, add 1½ tablespoons cocoa powder and 3 tablespoons maple syrup instead.
Instructions
-
Add the oats to a blender and blend for a few seconds.½ cup rolled oats
-
Add peanut butter, banana, milk, and protein powder. Blend until smooth and serve.¼ cup peanut butter, 1 banana, 2¼ cup milk, 1 scoop chocolate protein powder
Notes
- Don’t use steel-cut oats; they won’t blend smoothly.
- If you skip blending the oats first, some oats may remain in small pieces at the bottom—still edible but less smooth.
- Choose a peanut butter you enjoy; different brands vary in flavor even when ingredients are similar.
- If your protein powder is unsweetened, add maple syrup or a date for sweetness.
- Substituting cocoa powder + maple syrup for protein powder lowers protein and raises calories.
- To make it sweeter, add a pitted date or a little maple syrup.
- For extra creaminess and calories, add half an avocado.
- Any swaps (milk type, add-ins) change the nutrition information noticeably.
- Use a high-speed blender for the best texture, but a standard blender will work if blended thoroughly.