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Flourless Protein Peanut Butter Cookies
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⏱ 20 min total
💪 7g protein
🍽 12 cookies
These are protein cookies stripped to their essentials: no flour, no fancy ingredients, just peanut butter, whey, eggs, and sweetener. Four ingredients, one bowl, 20 minutes, and they come out tasting like the back-of-the-jar classic Jif peanut butter cookies your grandmother made. Each cookie clocks in at 7g of protein. The crisscross fork pattern on top is non-negotiable and not just for looks: it lets the centers cook through evenly while the edges crisp. Gluten-free by default, dairy-free with a single swap.
Ingredients
- 1 cup natural peanut butter (creamy, no sugar added)
- ⅓ cup vanilla whey protein powder (1 scoop)
- ⅓ cup brown sugar or coconut sugar
- 1 large egg
- ½ tsp baking soda
- ¼ tsp salt (skip if PB is salted)
- 1 tsp vanilla extract
- Optional 2 tbsp chopped dark chocolate or chocolate chips
Equipment
- Mixing bowl: medium, the batch is small
- Wooden spoon: stiff peanut butter needs leverage
- Baking sheet: lined with parchment, the cookies are too sticky for an unlined pan
- Fork: for the classic crisscross pattern (not just decorative)
- Cooling rack: important, they're delicate hot
Instructions
- Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
- In a medium bowl, combine the peanut butter, brown sugar, egg, vanilla, baking soda and salt. Stir vigorously with a wooden spoon for 1 minute until completely smooth.
- Add the whey protein and fold in. Stop the moment the dough is uniform. The dough should be thick and slightly sticky.
- If using chocolate chips, fold them in now.
- Scoop 12 tablespoon-sized portions onto the parchment, leaving 2 inches between them.
- Press each ball flat with a fork in a crisscross pattern. The pattern matters: it ensures even cooking and prevents the centers from staying raw.
- Bake for 10 to 12 minutes, until the edges are set and the centers still look slightly underdone.
- Cool on the pan for 5 minutes. The cookies are fragile straight from the oven. Then transfer to a wire rack to finish cooling.
Macros
145
Calories
7g
Protein
10g
Carbs
10g
Fat
Per cookie (1 of 12), made with natural peanut butter, brown sugar, and Optimum Nutrition Vanilla. Without optional chocolate chips.
Substitutions
- No brown sugar: use ¼ cup honey + ½ tsp molasses, or ⅓ cup coconut sugar
- Lower sugar: swap brown sugar for monk fruit-brown sugar blend. Keep 1 tbsp of real brown sugar for chew
- Dairy-free: use plant-based protein (pea, rice, or chocolate plant blend). Texture is denser but still works
- No egg: use 1 flax egg (1 tbsp ground flax + 3 tbsp water). The cookies will be slightly more crumbly
- Crunchy peanut butter: use crunchy PB instead of creamy. Adds nice peanut bits
- Almond butter version: 1-for-1 swap. The flavor is more delicate but excellent
Tips
Natural peanut butter is critical for these. The kind where oil separates on top. Regular Skippy or Jif have stabilizers and extra sugar that throw off the texture and push the macros badly. Stir the PB from the bottom of the jar to incorporate the oil. If you use cold PB straight from the fridge, microwave for 15 seconds to soften before measuring. The fork crisscross isn't optional: flourless cookies depend on physical flattening for even cooking. Leave the centers slightly soft when you pull them. They firm up on the pan and you avoid the brick-cookie outcome.
Which Powder Works Best
Vanilla whey is the ideal partner here. The peanut butter flavor is already strong, so you want a subtle, sweet base. Three picks, all tracked daily on our best-value page:
Optimum Nutrition
Gold Standard Whey: Vanilla Ice Cream
Soft vanilla note that lets the peanut butter take the lead. Bakes into a tender, chewy cookie.
Compare prices →
MyProtein
Impact Whey: Vanilla
Milder vanilla, cheap per scoop. Excellent if you're making cookies weekly.
Compare prices →
Dymatize
ISO100: Peanut Butter
Doubles down on the peanut flavor. Lactose-free isolate with 25g protein per scoop.
Compare prices →
FAQ
Why don't these need flour?
The peanut butter has enough natural binding fat and protein to hold the cookie together, especially once whey is added. Whey absorbs moisture and acts as a structural filler.
Are these gluten-free?
Yes, as long as your whey doesn't contain gluten (most don't). Check the label if you're celiac.
Why did mine spread too much?
Either the dough was too warm, or you used a regular sugary peanut butter instead of natural. Refrigerate the dough for 10 minutes before scooping if your kitchen is warm.
Can I make these crunchy instead of chewy?
Yes. Bake an extra 3 minutes and let them cool fully on the pan. They will crisp up considerably.
How long do they keep?
5 days in an airtight container at room temp. 2 weeks in the fridge. 3 months frozen.
Can I double the batch?
Yes, no issues. Use 2 cookie sheets and rotate them halfway through baking for even browning.
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