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
Ingredients
12 servings
Wet
50gEgg
large
1200gfat free buttermilk
liquid whey
¼ cupSugar free syrup
15gVanilla extract
15gLiquid monk fruit
Dry
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
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
Step 4

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
Step 6

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
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