Best Sugar Free Oatmeal Cookies With Peanut Butter (5 Ingredients!)
I first made these sugar-free oatmeal cookies on a rushed Sunday morning when my bananas were way past their prime. The result was surprisingly chewy, naturally sweet, and peanut-buttery — a five-ingredient cookie that’s perfect for school lunches, quick snacks, or when you want dessert without added sugar. If you like easy, honest baking that doesn’t skimp on flavor, this recipe is for you; it also pairs nicely with tips and variations from my sugar-free oatmeal cookie guide when you want more low-sugar options.
Why you’ll love this dish
These cookies are minimal-effort and maximum-return. They use pantry staples, require no added sugar, and rely on ripe bananas for sweetness. That makes them budget-friendly, kid-approved, and easy to scale up for a crowd or halve for a small batch. They stay soft if you store them right, and the peanut butter adds protein to keep you fuller longer — perfect for a breakfast-on-the-go or an after-school treat.
“Honestly the easiest cookie I’ve ever made — so chewy and peanut-buttery with only five ingredients.” — a happy tester
If you enjoy coconut in your baking, try a tropical spin with the sugar-free coconut oatmeal cookies I wrote about; the same freezer and make-ahead tips apply.
How this recipe comes together
This cookie is a three-part process: mash, mix, and bake. First, mash very ripe bananas until smooth. Stir in peanut butter and vanilla to form a slightly runny batter. Add rolled oats and fold in sugar-free chocolate chips — the oats thicken the mix into a scoopable dough. Form walnut-sized balls, flatten them, and bake at 350°F for 10–12 minutes until edges are lightly golden. Little spreads happen in the oven, so shape matters.
For a comparison of texture and mix-ins, see how other small-batch cookies come together in my notes on soft and chewy cookie techniques.
Gather these items
What you’ll need for about 18–20 small cookies:
- 2 large overripe bananas, thoroughly mashed (the riper, the sweeter)
- 1/3 cup creamy peanut butter (natural or regular; see notes)
- 1/2 teaspoon vanilla extract
- 1 3/4 cups old-fashioned rolled oats (do not use instant if you want the best texture)
- 1/4 cup sugar-free chocolate chips or cacao nibs
Ingredient notes and substitutions:
- Bananas: Overripe (freckled brown) bananas give more natural sweetness. If using less-ripe bananas, add 1–2 teaspoons of a sugar substitute.
- Peanut butter: Natural peanut butter can make the dough slightly looser. If that happens, add 2–3 tablespoons more oats. For a nut-free version, swap for sunflower seed butter (be aware of a greener tint and slightly different flavor).
- Oats: Old-fashioned rolled oats give structure; quick oats will produce a softer, somewhat denser cookie. For gluten-free, use certified gluten-free rolled oats.
- Chocolate: Use sugar-free chips for low-sugar needs or cacao nibs for less sweetness and more crunch.
How to prepare it
- Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
- In a large bowl, mash the bananas until mostly smooth.
- Add the peanut butter and vanilla. Stir until the mixture is homogeneous.
- Gradually add the rolled oats and mix until evenly combined and scoopable.
- Fold in the sugar-free chocolate chips or cacao nibs.
- Wet your hands slightly to prevent sticking. Scoop walnut-sized portions and roll into balls.
- Place cookies 1½ inches apart on the prepared sheet. Press each gently to flatten to cookie shape.
- Bake 10–12 minutes, until edges are lightly golden. Cookies won’t spread much — shape them as you like before baking.
- Let cool on the baking sheet for 5 minutes, then transfer to a wire rack to finish cooling.
For texture contrast or caramel notes, I sometimes riff on this dough with mix-ins similar to those in my peanut-butter chocolate caramel cookie experiments.
Best ways to enjoy it
- Breakfast: Serve warm with a smear of extra peanut butter and a side of Greek yogurt or a small glass of milk.
- Snack: Pack one or two with a piece of fruit for a balanced afternoon pick-me-up.
- Dessert: Plate with a dollop of unsweetened whipped cream and a dusting of cinnamon.
- Kid-friendly lunchbox: Add a cheese stick and carrot sticks for a well-rounded lunch.
For a café-style presentation, stack three cookies on a small dessert plate and drizzle a tiny bit of warmed peanut butter or sugar-free chocolate over the top.
How to store & freeze
Short-term storage:
- Room temperature: Store in an airtight container for up to 2 days.
- Refrigerator: Keep in an airtight container for up to 5 days. Let cookies come to room temperature or warm 10–15 seconds in the microwave.
Freezing:
- Freeze baked cookies in a single layer on a sheet tray for 1 hour, then transfer to a freezer bag. They keep well for up to 3 months.
- Thaw at room temperature for 20–30 minutes or reheat in a 300°F oven for 5–8 minutes.
Food safety: Cool cookies completely before sealing to prevent condensation and sogginess. If you use nut-free seed butter, label the container accordingly for allergy awareness.
Helpful cooking tips
- Use very ripe bananas for maximum natural sweetness and moisture.
- If dough is too wet, add oats 1 tablespoon at a time until scoopable.
- If dough is too dry (rare), stir in 1 teaspoon of milk or a bit more mashed banana.
- Press cookies gently before baking; since they don’t spread much, this determines the final shape and thickness.
- For even baking, rotate the baking sheet halfway through the bake time.
- To keep cookies chewy, don’t overbake — remove when edges just begin to color.
- To measure oats: spoon into the cup and level — don’t pack.
Creative twists
- Chocolate-swirl: Add 1–2 tablespoons of melted sugar-free chocolate to the tops before baking for a marbled effect.
- Nutty crunch: Stir in 2 tablespoons chopped toasted almonds or walnuts (if not allergic).
- Cinnamon-maple: Add 1/2 teaspoon ground cinnamon and 1 teaspoon sugar-free maple syrup for warm flavor.
- Fruit-studded: Mix in 2 tablespoons finely chopped dried apricots or unsweetened cranberries for chew and color.
- Swap peanut butter for almond butter or sunflower seed butter to fit dietary needs.
Your questions answered
Q: How long does this take from start to finish?
A: Plan on about 5 minutes to mash and mix, 10 minutes to form cookies, and 10–12 minutes baking time. Total active time ~25 minutes; total time ~35 minutes including cooling.
Q: Can I use quick oats or oat flour instead of rolled oats?
A: Quick oats will work but create a softer, denser cookie. Oat flour will make a different texture (more cake-like) and you’ll likely need to adjust liquid — start with 1 cup oat flour and add a tablespoon at a time until scoopable.
Q: Are these cookies safe for people with diabetes?
A: These are sugar-free because they rely on banana for sweetness, which contains natural sugars. They’re lower in added sugar but still contain carbs from banana and oats. Portion control and checking with a healthcare provider are recommended.
Q: Can I make the dough ahead and bake later?
A: Yes — refrigerate shaped cookies for up to 24 hours and bake straight from the fridge; add 1–2 minutes to the baking time. You can also freeze unbaked cookie balls and bake from frozen (add 2–4 minutes).
Q: My dough is crumbly — what went wrong?
A: Crumbliness usually means either the peanut butter is too dry or the bananas weren’t ripe/mashed enough. Mix in a teaspoon of water, milk, or another tablespoon of mashed banana to bind. If you used natural peanut butter, the oil may have separated; stir it well before measuring.
Conclusion
These five-ingredient, sugar-free oatmeal peanut butter cookies are a dependable, quick bake when you want something sweet without added sugar. For extra inspiration and alternative methods that produce a slightly different texture or flavor profile, check out a similar tested recipe at Beaming Baker’s healthy peanut butter oatmeal cookies and a soft, chewy take at Well Plated’s healthy peanut butter oatmeal cookies. Enjoy experimenting and making this simple recipe your own.
Sugar-Free Oatmeal Peanut Butter Cookies
Ingredients
Main ingredients
- 2 large overripe bananas, thoroughly mashed The riper, the sweeter.
- 1/3 cup creamy peanut butter Natural or regular; see notes.
- 1/2 teaspoon vanilla extract
- 1 3/4 cups old-fashioned rolled oats Do not use instant for the best texture.
- 1/4 cup sugar-free chocolate chips or cacao nibs
Instructions
Preparation
- Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
- In a large bowl, mash the bananas until mostly smooth.
- Add the peanut butter and vanilla, stirring until the mixture is homogeneous.
- Gradually add the rolled oats and mix until evenly combined and scoopable.
- Fold in the sugar-free chocolate chips or cacao nibs.
- Wet your hands slightly to prevent sticking, then scoop walnut-sized portions and roll into balls.
- Place cookies 1½ inches apart on the prepared sheet and gently press each to flatten.
Baking
- Bake for 10–12 minutes, until edges are lightly golden. Cookies won’t spread much, so shape them as desired before baking.
- Let cool on the baking sheet for 5 minutes, then transfer to a wire rack to finish cooling.
