5-Ingredient Peanut Butter Oatmeal Cookies

These 5-ingredient peanut butter oatmeal cookies are soft in the middle, a little crisp at the edges and full of peanut butter flavor. They need no flour and no butter. You only need peanut butter, oats, brown sugar, one egg and baking soda. Mix them in one bowl, scoop and bake. They're ready in about 20 minutes.

They're perfect for beginners, kids who want to help in the kitchen, and anyone who wants cookies fast.

Why This Recipe Works

• Peanut butter gives fat, flavor and structure, so there's no need for butter.
• Oats replace flour and make the cookies chewy and hearty.
• Brown sugar keeps them soft and adds a caramel taste.
• One egg binds everything together.
• Baking soda helps them puff and spread just right.

Quick Facts

• Prep time: 10 minutes
• Cook time: 10 minutes
• Total time: 20 minutes
• Makes: about 16 cookies
• Difficulty: Very easy

The 5 Ingredients

• 1 cup (250 g) creamy peanut butter
• ¾ cup (150 g) packed brown sugar
• 1 large egg
• 1 teaspoon baking soda
• 1 cup (90 g) old-fashioned rolled oats

Optional extras (not counted in the 5): ½ cup chocolate chips, 1 teaspoon vanilla, a pinch of salt, flaky sea salt for the top.

Which Peanut Butter Is Best?

Regular creamy peanut butter (like the common store brands) gives the best results. It has a stable texture, so cookies hold their shape.

Natural peanut butter (only peanuts and salt) is oilier and runnier. Stir it very well. The cookies may spread more and be a little more crumbly. Chilling the dough for 20–30 minutes helps.

Crunchy peanut butter works too, and adds a nice crunch.

Which Oats to Use?

• Old-fashioned rolled oats: Chewy and hearty. Our favorite.
• Quick oats: Softer, more tender cookies with a smoother texture.
• Steel-cut oats: Don't use. They stay hard.

Step 1: Heat the Oven

Heat the oven to 350°F (175°C). Line a baking sheet with parchment paper.

Step 2: Mix the Wet Ingredients

In a large bowl, stir the peanut butter, brown sugar and egg until smooth and creamy. Add vanilla and salt if using.

Step 3: Add Baking Soda and Oats

Sprinkle the baking soda over the mixture and stir well so it spreads evenly. Then stir in the oats until fully mixed. Fold in chocolate chips if you like.

The dough will be thick and a little sticky.

Step 4: Scoop and Shape

Scoop about 1½ tablespoons of dough per cookie. Roll into balls and place on the baking sheet about 2 inches apart.

Flatten each ball slightly with your fingers or a fork. For the classic look, press a fork in one direction, then across to make a crisscross pattern.

Sticky dough? Wet your hands a little, or chill the dough for 15 minutes.

Step 5: Bake

Bake for 9–11 minutes, until the edges are lightly golden but the centers still look a little soft and puffy.

Don't overbake. They keep cooking on the hot pan and firm up as they cool. If they look fully done in the oven, they'll be dry later.

Step 6: Cool

Let the cookies cool on the baking sheet for 10 minutes. They're very soft when hot and may break if moved too soon. Then move them to a rack to cool completely.

Sprinkle a little flaky salt on top while warm, if you like.

Tips for Perfect Cookies

• Use regular creamy peanut butter for the most reliable result.
• Don't overbake. Take them out when the centers look soft.
• Cool on the pan before moving them.
• Chill the dough if using natural peanut butter.
• Measure oats correctly by spooning them into the cup.

Common Problems

Cookies spread too much. The peanut butter was oily, or the dough was warm. Chill the dough before baking.

Cookies are crumbly. They were overbaked, or natural peanut butter was used. Bake a little less, or add 1–2 tablespoons more oats.

Dry cookies. Overbaked. Start checking at 9 minutes.

Didn't spread at all. The dough was too cold or had too many oats. Press them flatter before baking.

Variations

• Chocolate chip: Add ½ cup chocolate chips.
• Monster cookies: Add chocolate chips and candy-coated chocolates.
• Banana: Add ¼ cup mashed banana and 2 extra tablespoons oats.
• Lower sugar: Use ½ cup brown sugar. Cookies will be a bit less soft.
• Almond butter: Swap for peanut butter for a different nut flavor.
• Vegan: Use a flax egg (1 tablespoon ground flaxseed + 3 tablespoons water, rested 10 minutes).

Are They Gluten-Free?

There's no flour in this recipe. Oats are naturally gluten-free, but they're often processed with wheat. If you need these cookies to be fully gluten-free, use oats labeled certified gluten-free.

Allergy Note

These cookies contain peanuts and egg. For a nut-free version, try sunflower seed butter (the cookies may turn slightly green inside; this is a harmless reaction with baking soda).

Storage

Room temperature: In an airtight container for 4–5 days.

Freezer (baked cookies): Up to 3 months. Thaw at room temperature.

Freezer (dough balls): Freeze on a tray, then bag. Bake from frozen, adding 1–2 minutes.

Nutrition Estimate

Per cookie (1/16 of the recipe, without chocolate chips):

• Calories: about 150
• Protein: about 5 g
• Carbohydrates: about 15 g
• Fiber: about 1.5 g
• Fat: about 8 g

FAQs

Can I make these cookies without an egg?

Yes. Use a flax egg: 1 tablespoon ground flaxseed mixed with 3 tablespoons water, rested 10 minutes.

Can I use white sugar?

Yes, but cookies will be crispier and less chewy. Brown sugar keeps them soft.

Why are my cookies falling apart?

They weren't cooled long enough on the pan, or natural peanut butter made them crumbly.

Can I use quick oats?

Yes. The cookies will be softer and less chewy.

Are peanut butter oatmeal cookies healthy?

They have protein and fiber from peanut butter and oats, but still contain sugar. Enjoy them as a treat.

Can I double the recipe?

Yes. Bake in batches so each tray has space.

More Recipes to Try

• 3 Ingredient Banana Oatmeal Cookies (coming soon)
• Chewy Chocolate Chip Cookies With No Chilling (coming soon)
• No Bake Keto Peanut Butter Chocolate Pie (coming soon)
• Browse all recipes

A Final Note

Five simple ingredients, one bowl and about 20 minutes. Take them out while the centers still look soft, let them cool on the pan, and you'll have chewy peanut butter oatmeal cookies every time.