Three-Ingredient Peanut Butter Cookies
Peanut butter, sugar, egg. No flour, no butter, no leavening — twenty minutes start to finish.
What's going on here
This works because peanuts are roughly 25% protein, and that protein does the structural job flour normally would. The egg coagulates and sets a network, the sugar dissolves and recrystallises to provide rigidity, and the ground peanut solids act as bulk filler — so you get a cookie with no gluten anywhere in it. That's also the limitation: without gluten there's nothing elastic holding it together, so these are fragile hot and must cool completely on the pan before they're moved. Conventional peanut butter is important here in a way it isn't elsewhere, because its added sugar and emulsifiers contribute to the set; natural peanut butter has more free oil and less sugar and gives a greasy, crumbly result. The cookies barely spread, so they're flattened before baking, and they should come out looking slightly underdone.
Ingredients
Dough
- 1 cupPeanut butter
conventional, smooth or crunchy
- 1 cupGranulated sugar
- 1Egg
- 1/4 tspSalt(optional)
- 1 tspVanilla extract(optional)
Instructions
Dough
- Stir the peanut butter, sugar, and egg together in a bowl until completely uniform — plus the salt and vanilla if using.
Tip: A wooden spoon is enough. There's no gluten to develop, so you cannot overmix this dough.
Bake
- Roll into balls, space on a lined sheet, and flatten each with a fork in a criss-cross. They spread very little.
- Bake at 175°C (350°F) until the edges are set and the tops look dry but the centres are still soft.
Cool
- Leave them on the pan until completely cool before lifting them off.
Tip: This is not optional. With no flour there's no gluten network, so warm cookies fall apart the moment you touch them. They firm up entirely as they cool.
Claude Score
Well-built recipe. Sound ratios and real flavor development.
- Ratio soundness25% of total
- 84
- Flavor development25% of total
- 82
- Texture control20% of total
- 78
- Reliability20% of total
- 86
- Pantry accessibility10% of total
- 100
How well the formula holds up against known working ratios.
Whether the method builds flavor or merely combines ingredients.
How deliberately moisture, gluten, starch, and fat are controlled.
How much margin for error the recipe leaves a home cook.
Whether you can make it from staples, right now, with normal gear.
A genuinely clever bit of food science — peanut protein standing in for flour — and unbeatable on accessibility. Texture is marked down because a gluten-free, fat-heavy cookie is inherently crumbly.
Scored on the science of cooking — ratios, flavour development, texture control, how forgiving the method is, and whether you can make it from what's in the cupboard. Not a measure of how much you'll like it.
Tips for this recipe
Naturally gluten-free
There's no flour anywhere in this recipe, so it's coeliac-safe as long as your peanut butter and vanilla are certified gluten-free — worth checking, since some brands add wheat-derived ingredients.
Cookies fell apart
They were moved while warm. Cooling completely on the pan is the whole structural step here, because there's no gluten to hold them together while hot.