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Paul Scally
By Paul Scally

Discard Whey Protein Bars

7 steps
Prep:15minCook:1h
After making homemade yogurt the other day, I was left with a bunch of leftover liquid whey. Wanting to use it up all at once, I created these protein bars. They have a base of liquid whey, are sweetened with sugar free syrup and liquid monk fruit, and get their protein from powdered peanut butter and casein protein powder. The result is 12 protein bars each with 13 g of protein in just over 100 calories. They also have 5 g of fiber each, are low in fat, and contain no added sugar.
Updated at: Mon, 01 Jun 2026 00:13:41 GMT

Nutrition balance score

Great
Glycemic Index
23
Low
Glycemic Load
3
Low

Nutrition per serving

Calories125.2 kcal (6%)
Total Fat2 g (3%)
Carbs15.1 g (6%)
Sugars5.9 g (7%)
Protein13.8 g (28%)
Sodium431.2 mg (22%)
Fiber5 g (18%)
% Daily Values based on a 2,000 calorie diet

Instructions

Step 1
Preheat your oven to 350F. Line a 9x13" pan with parchment paper. Lightly grease it with oil
Step 2
Beat your egg in a large bowl. Whisk in the wet ingredients - liquid whey, sugar free syrup, vanilla extract, and liquid monk fruit
EggEgg50g
fat free buttermilkfat free buttermilk1200g
Sugar free syrupSugar free syrup¼ cup
Vanilla extractVanilla extract15g
Liquid monk fruitLiquid monk fruit15g
Step 3
Using a silicone spatula, stir in all the dry ingredients - powdered peanut butter, casein protein powder, cocoa powder, psyllium husk, baking powder, cinnamon, and salt
Powdered peanut butterPowdered peanut butter1 cup
Protein powderProtein powder90g
Cocoa powderCocoa powder½ cup
Psyllium huskPsyllium husk½ cup
Baking powderBaking powder15g
CinnamonCinnamon10g
saltsalt3g
Step 4
Let the batter rest in the bowl for about 10 minutes for the psyllium to thicken the batter
Let the batter rest in the bowl for about 10 minutes for the psyllium to thicken the batter
Step 5
Transfer the batter to the pan. Bake at 350F for 1 hour, or until a toothpick comes out clean
Transfer the batter to the pan. Bake at 350F for 1 hour, or until a toothpick comes out clean
Step 6
Let cool in the pan at room temperature for 30 minutes before cutting into 12 protein bars
Let cool in the pan at room temperature for 30 minutes before cutting into 12 protein bars
Step 7
Store the protein bars in an airtight bag in the freezer, separating each one with a piece of parchment paper
Store the protein bars in an airtight bag in the freezer, separating each one with a piece of parchment paper
View on poormanprotein.com
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