Chocolate Peanut Butter Protein Cookies
Soft and chewy chocolate peanut butter protein cookies made with simple ingredients and a balanced protein boost. An easy, everyday bake that delivers proper cookie texture while giving you a cheeky 12g of protein
January is well underway and the quest for sneaking more protein into my diet (without having to chug endless unpleasant proteins shakes) continues. My latest go-to high-protein snack is chocolate peanut butter protein cookies — big, soft and chewy, with just enough sweetness to feel like a treat.
With only a handful of ingredients and ready in under 20 minutes, they’re a practical way to boost protein intake while still satisfying a sweet tooth, without tipping into sugar overload.
This recipe has quickly become popular in my household — left unsupervised, my daughter would absolutely demolish them within minutes of coming out of the oven. And with each cookie containing around 12 g of protein and roughly 165 calories, they’re a sensible option as far as cookies go.
Ingredients Breakdown
Peanut butter
The core ingredient of chocolate peanut butter protein cookies. Peanut butter provides the fat and structure, giving the cookies their dense, soft texture. Smooth peanut butter works better here as it mixes more evenly, but if you want some peanut crunch in there, use a 50/50 mix of smooth and crunchy.
Protein powder
If you want to add more protein to your diet, then protein powder is your best friend. I always use whey protein powder as I cannot stand egg or the vegan ones. Therefore I am recommending to use whey as I don’t know how the others react when cooking. Here is a guide for cooking with vegan protein powders that might be useful.
Protein powders come in almost every flavour under the sun these days. For this, I would recommend using chocolate or something chocolaty, as these are chocolate peanut butter protein cookies. You could also use peanut butter or vanilla and add a little cacao powder to make the cookies chocolaty.
I actually used Mars protein powder for this, because I saw it on sale for a very reasonable price. It sounds better than it tastes, and it tastes far better baked into a cookie than it does as a shake.
Egg
Binds the dough and adds moisture, helping the cookies hold together while baking.
Light brown sugar
Adds mild sweetness and a hint of caramel depth while contributing to softness; white sugar will work but produces a drier result.
Chocolate chips
Name a better duo that chocolate and peanut butter. I dare you… I recommend using dark chocolate here to avoid introducing excess sugar to the cookies. They are supposed to be somewhat healthy, remember.
Sodium Bicabronate (baking soda)
Provides gentle lift so the cookies bake through without becoming dense; using a smaller amount keeps the texture cookie-like rather than cakey.
Milk
You may need it. Maybe not. Some peanut butter are drier than others, and some eggs are smaller than others. If your cookie mix is crumbling and falling apart, it means it’s too dry and needs a splash of milk. Plant versions work equally well here.
Step-by-Step Instructions
Prep the oven and tray
Heat the oven to 180°C (fan 160°C). Line a large baking tray with baking paper (or use two trays if needed so the cookies aren’t crowded). Position a rack in the middle of the oven.
Mix the wet base
In a medium bowl, stir together the peanut butter, brown sugar, egg, and a pinch of salt until the mixture looks smooth and glossy. If your peanut butter is very stiff, warm it for 5–10 seconds in the microwave so it mixes evenly and easily.
Add the protein powder and baking powder
Add the protein powder and ¼ tsp baking powder, and a pinch of salt, then mix until no dry pockets remain. The dough should be thick and slightly tacky. If it looks dry or crumbly (common with some protein powders), add milk 1 tablespoon at a time until it holds together when pressed.
Fold in the chocolate
Add the chocolate chips and fold through so they’re evenly distributed. If the dough feels warm and greasy, chill it for 10–15 minutes so the cookies hold their shape better in the oven.
Portion and shape
Divide the dough into 8 portions (about 35-40 g each) for even baking and consistent macros. Roll into balls, place on the tray with space between them, then flatten gently to about 1.5–2 cm thick—unlike traditional cookies, they won’t spread much on their own.
Bake until just set
Bake for 8-10 minutes, depending on your oven and cookie size. You’re looking for edges that look set and slightly darker, while the centres still look a touch soft and underdone; they’ll firm up as they cool. If the tops are browning fast, your oven is running hot—drop the temperature by 10°C next time.
Cool to finish the texture
Leave the cookies on the tray for 10 minutes to set, then transfer to a rack. If you move them too early, they can break as they need the time to set.
Chocolate Peanut Butter Protein Cookies
Ingredients
- 120 g smooth peanut butter
- 40 g light brown sugar
- 1 large egg
- 60 g protein powder whey
- ¼ tsp bicarbonate of soda bicarb
- 1 –3 tbsp milk as needed (15–45 ml)
- 40 g dark chocolate chips
- ¼ tsp fine salt
Instructions
- Heat the oven to 180°C (fan 160°C). Line a large baking tray with baking paper.
- In a bowl, mix the peanut butter, brown sugar, egg, and salt until smooth.
- Stir in the protein powder and bicarbonate of soda, until a thick dough forms. It should be very thick, but not break apart and crumble when handled. If the dough is crumbly, add milk 1 tbsp at a time until it holds together when pressed.
- Fold in the chocolate chips.
- Divide into 8 portions (35-40 g each). Roll into balls, place on the tray, then flatten to about 1.5–2 cm thick.
- Bake for 8–10 minutes until the edges are set and slightly darker, but the centres still look soft.
- Cool on the tray for 10 minutes, then transfer to a rack to finish cooling.
Notes
- Double-chocolate: Add 10 g cocoa powder and an extra 1 tbsp milk to keep the dough supple; use dark chocolate chunks for contrast.
- Salted crunch: Swap half the smooth peanut butter for crunchy peanut butter, and sprinkle a small pinch of flaky salt over the tops before baking.
- Mocha: Add 1 tsp espresso powder to the dry ingredients for a deeper, less sweet finish
Store cooled cookies airtight for 2 days at room temperature or 5 days in the fridge. Freeze for up to 2 months; thaw at room temperature, then warm in a low oven for 3–5 minutes to soften the centres.
This usually comes from too much lift or too much egg white. You really only want a little bicarb in there. A quarter of a teaspoon max.
Once fully cooled, store them in an airtight container for up to two days at room temperature or five days in the fridge. For longer storage, freeze them and thaw at room temperature when needed.
The dough can be mixed and refrigerated for up to 24 hours. If it firms up too much, let it sit at room temperature for 10 minutes before shaping and baking.
Warm dough or very soft peanut butter can cause excess spread. Chilling the dough briefly or using a firmer peanut butter usually fixes this on the next batch.
They’re best eaten slightly warm or at room temperature, when the centres stay soft and chewy. If they’ve been chilled, a few minutes out of the fridge brings the texture back.
