These no-added-sugar protein cookies are made with oat flour, plain protein powder, peanut butter, egg, and granulated allulose for a lightly sweet, soft-centered bake. They are easy to mix in one bowl, portion into small cookies, and serve as a snack or simple dessert; the sweetness and texture can be adjusted with a few practical swaps.
Ingredients
- 1 cup (90 g) oat flour
- 1/2 cup (50 g) plain, unsweetened whey protein powder
- 1/2 cup (128 g) smooth, unsweetened peanut butter, well stirred
- 1/3 cup (65 g) granulated allulose
- 1 large egg (about 50 g without the shell), at room temperature
- 2 tablespoons (30 ml) milk, plus up to 1 tablespoon (15 ml) more if needed
- 1 teaspoon (5 ml) vanilla extract
- 1/2 teaspoon (2 g) baking powder
- 1/8 teaspoon (0.5 g) fine salt
Instructions
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Heat the oven to 350°F (175°C). Line a large baking sheet with parchment paper. Measure the ingredients before mixing, and stir the peanut butter thoroughly if oil has separated in the jar. This recipe makes 12 small cookies, so use a second sheet or bake in two batches if your tray cannot hold them with room to spread.
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In a medium bowl, whisk together the oat flour, protein powder, baking powder, and salt. Break up any compacted protein powder so there are no dry clumps. A whisk distributes the leavening more evenly than stirring it into the wet ingredients later, which helps the cookies bake consistently.
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In a second bowl, stir the peanut butter and allulose until combined. Add the egg, 2 tablespoons (30 ml) milk, and vanilla, then mix until smooth. Tip the dry ingredients into the wet mixture and stir with a sturdy spoon or spatula until no loose flour remains. The dough should be thick and slightly tacky, not pourable.
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Check the consistency before portioning. If the dough looks crumbly and will not hold together when pressed, stir in the extra milk 1 teaspoon at a time, using no more than 1 tablespoon (15 ml). Protein powders vary in how much liquid they absorb, so a small adjustment is more reliable than adding all the extra milk at once. If the dough is very sticky, let it sit for 2 minutes before adding any flour; the oat flour and protein powder continue to absorb moisture.
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Cover the bowl and chill the dough for 15 minutes. This short rest firms the peanut butter and makes the portions easier to shape. Scoop the dough into 12 equal mounds, about 1 tablespoon each, and roll them lightly between your hands. Arrange them on the prepared sheet with about 2 inches (5 cm) between cookies, then press each mound to about 1/2 inch (1.25 cm) thick. They do not spread as much as conventional sugar cookies.
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Bake for 10 minutes, until the edges look set and the tops no longer appear wet. The centers may still feel soft; do not wait for them to become crisp in the oven, because they firm as they cool. Since the recipe contains egg, the USDA FSIS safe minimum for egg dishes is 160°F (71°C); if checking, use a thin-tip instant-read thermometer in the center of a thicker cookie. Avoid judging doneness by color alone, as allulose can brown differently from ordinary sugar.
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Leave the cookies on the baking sheet for 10 minutes, then transfer them carefully to a rack to finish cooling. They are delicate while hot and become easier to handle as they set. Let the tray cool before using it for another batch, or the dough may soften and spread more quickly on a warm surface.
Tips
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Use a plain protein powder. Choose an unsweetened powder with no added sugar or sweetener so you can control the sweetness. Vanilla-flavored powders can work, but they may be sweetened already and can make the cookies taste much sweeter; reduce or omit the allulose if the product label indicates it is sweetened. Whey protein is the intended choice here. Plant-based powders often absorb more liquid and can make a firmer, drier dough, so add milk gradually and expect a slightly different crumb.
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Measure flour by weight if possible. Scooping oat flour straight from its container can pack extra into the cup and dry out the dough. Spoon it into the measuring cup and level it, or use the listed 90 g amount. The same care helps with protein powder, which varies considerably in density between brands.
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Do not bake until crisp. The cookies should look set around the outside but remain tender in the middle when they come out. Protein powder can turn dry or chalky if the cookies stay in the oven too long. Check at 9 minutes the first time you make them, since ovens and baking sheets can differ, and remove them once the centers are no longer glossy.
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Adjust sweetness thoughtfully. Allulose is less sweet than regular granulated sugar, so the cookies are deliberately mild rather than candy-sweet. If using an erythritol-based baking blend instead, follow its package conversion for sweetness; blends vary, and a full cup-for-cup swap may make this small batch overly sweet. That substitution can also give the cooled cookies a firmer texture and a slight cooling sensation.
Serving Suggestions
Serve the cookies once fully cooled, when their centers have had time to set. They are a good size for packing alongside fruit, or for serving with coffee, tea, or a glass of milk. For a simple dessert plate, pair one or two cookies with plain yogurt and sliced berries; this adds a fresh, tart contrast without changing the recipe itself. If serving them warm, let them rest for at least 10 minutes first so they do not crumble when lifted.
For a more substantial snack, split a cooled cookie and spread a thin layer of peanut butter between the halves. You can also crumble one over a bowl of yogurt or oatmeal just before serving. The cookies are intentionally only lightly sweet, so they pair especially well with naturally tart fruit or an unsweetened drink. If you are serving a group, set out the cookies with a small dish of extra peanut butter or a sugar-free chocolate spread so people can add their own topping.
Variations
Chocolate version: Fold 2 tablespoons (about 20 g) of unsweetened cocoa powder into the dry ingredients. Because cocoa absorbs liquid, add 1 to 2 teaspoons (5 to 10 ml) extra milk if the dough becomes crumbly. You can also stir in 2 tablespoons (about 25 g) of sugar-free chocolate chips, checking the label if avoiding added sugar is important to you. The cocoa makes the cookies less sweet and more pronounced in flavor.
Nut-free option: Replace the peanut butter with 1/2 cup (128 g) of smooth sunflower seed butter. Choose an unsweetened product and stir it well before measuring. Sunflower seed butter can make the dough a little softer or give it a greenish tint after baking; that color change is a harmless reaction between the seed butter and baking soda or other alkaline ingredients, though this recipe uses baking powder and the effect may be subtle. Check allergy labels on the protein powder and other ingredients as well.
Different nut butter: Almond butter can replace peanut butter in the same quantity, but some brands are thinner or oilier. If the dough looks loose after mixing, chill it for an additional 10 minutes before shaping rather than adding a large amount of flour. A thicker butter tends to give a more cohesive dough.
Spiced cookies: Add 1/2 teaspoon (1 g) ground cinnamon or 1/4 teaspoon (0.5 g) ground ginger to the dry ingredients. These spices work well with the oat and peanut flavors without making the cookies sweeter. For a little texture, fold in 2 tablespoons (about 18 g) chopped roasted peanuts; keep the pieces small so the cookies still hold together when shaped.
Storage and Reheating
Cool the cookies completely, then place them in an airtight container. Refrigerate them within 2 hours of baking, and keep them refrigerated for 3 to 4 days. Because this recipe contains egg and has a soft, moist texture, refrigeration is a sensible way to store leftovers. Separate layers with parchment if you stack them, so the tender cookies do not stick together.
For longer storage, freeze the cooled cookies in a freezer-safe container or bag for up to 2 months. Place parchment between layers, press out excess air, and label the container with the date. Thaw individual cookies in the refrigerator or at room temperature until soft. To warm one, microwave it for about 8 to 12 seconds, or heat it in a 300°F (150°C) oven for 3 to 5 minutes. Avoid prolonged heating, which can dry out protein-based baked goods. Discard cookies that have been left at room temperature for more than 2 hours.
Frequently Asked Questions
Are these cookies completely sugar-free?
They contain no added sugar when made with unsweetened peanut butter, plain unsweetened protein powder, and allulose. Ingredients can differ by brand, so check labels if you need to avoid particular sweeteners or sugars. Oat flour and peanut butter contain naturally occurring carbohydrates, and the recipe does not claim to be carbohydrate-free.
Can I use a different protein powder?
Yes, but the result can change because whey, casein, and plant-based powders absorb liquid differently. Whey is the recipe’s starting point. With a plant-based powder, begin with the listed 2 tablespoons of milk and add more only if the dough will not hold together. Avoid flavored powders unless you account for their sweeteners and flavoring.
Can I make the dough ahead?
Yes. Cover the mixed dough and refrigerate it for up to 24 hours, then portion and bake it cold. If it has become very firm, leave it on the counter for about 10 minutes so it is easier to scoop. The required 15-minute chill is already included in the recipe timing; an overnight rest is optional and adds to the total time.
Why did my cookies turn out dry?
The most common causes are too much flour or protein powder, a powder that absorbs more liquid than whey, or baking for too long. Weigh the dry ingredients when you can, add milk a teaspoon at a time if the dough is crumbly, and take the cookies out when their edges are set rather than waiting for a browned, crisp top. Letting them cool on the tray also helps the centers finish setting without extra oven time.
Can I make these without an egg?
The egg helps bind the dough and gives the cookies structure, so an egg replacement may make them more fragile. A commercial egg replacer can work if its package directions allow it in cookies, but the dough may need a small adjustment to the milk. Make one small test cookie before baking the whole tray, and confirm it holds together once cooled.
Can I use regular sugar instead of allulose?
Yes, you can use 1/3 cup (about 67 g) granulated sugar for a sweeter cookie with more conventional browning. The recipe would then no longer be made without added sugar. Do not substitute a liquid sweetener in the same amount: extra liquid changes the dough consistency, and the cookies may spread or bake unevenly.
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