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Easy No-Bake Peanut Butter Protein Bars with Oats and Honey

These homemade Peanut Butter Protein Bars combine creamy peanut butter, hearty rolled oats, whey protein powder, honey, and skim milk for a satisfying snack. With a soft, chewy texture and rich peanut butter flavor, these easy no-bake protein bars are perfect for post-workout snacking, meal preparation, or busy afternoons. No oven required!
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Total Time 20 minutes
Servings: 16
Course: Snack
Ingredients Method Notes

Ingredients
  

  • ½ cup skim milk plus more if needed
  • 1 cup natural-style peanut butter or low-fat peanut butter
  • 1 tablespoon honey
  • 1¼ –1½ cups whey protein powder preferably vanilla or chocolate
  • 2 cups dry old-fashioned rolled oats not quick-cooking oats

Method
 

  1. Prepare the pan. Line a 9 × 13-inch baking pan with parchment paper, leaving a little overhang to make removing the bars easier.
  2. Warm the peanut butter mixture. Add the peanut butter, honey, and skim milk to a medium saucepan. Place over low heat and stir until the mixture softens and becomes easier to combine.
  3. Add the protein powder. Remove the saucepan from the heat or keep it on very low heat. Gradually stir in the whey protein powder until evenly incorporated.
  4. Mix in the oats. Add the dry rolled oats and stir thoroughly until they are coated with the peanut butter mixture.
  5. Adjust the consistency. If the mixture becomes too thick or difficult to stir, add a small splash of extra milk. It should be thick and cohesive enough to press into a pan.
  6. Press into the pan. Transfer the mixture to the prepared baking pan. Press firmly into an even layer using a spatula or the back of a spoon.
  7. Allow to cool. Let the mixture cool and firm up. Refrigerate if necessary to help the bars hold their shape.
  8. Cut into bars. Once firm enough to slice, remove from the pan and cut into 16 equal-sized bars.
  9. Wrap and store. Wrap the bars individually in food-safe wrap or foil and refrigerate in an airtight container.

Notes

  • Peanut butter: Natural-style or low-fat peanut butter can be used. Their consistency and moisture content may vary.
  • Protein powder: Vanilla whey protein powder provides a mild sweetness, while chocolate whey protein creates a chocolate-peanut-butter flavor.
  • Protein powder quantity: Start with 1¼ cups and increase toward 1½ cups if the mixture can accommodate more without becoming dry.
  • Oats: Use old-fashioned rolled oats rather than quick-cooking oats for the intended chewy texture.
  • Heating: Warm the peanut butter, honey, and milk gently. The mixture should only be warmed enough to combine the ingredients, not cooked.
  • Consistency: Add extra milk gradually if the mixture becomes too thick to stir or press into the pan.
  • Pan size: Use a 9 × 13-inch baking pan and press the mixture evenly before cooling.
  • Cutting: Allow the mixture to firm up before dividing it into 16 bars.
  • Wrapping: Individual wrapping makes the bars convenient to portion and transport.
  • Storage: Although the original preparation suggests that refrigeration is unnecessary, these bars contain milk and hydrated oats and have no validated shelf-stable preservation process. Store them in the refrigerator rather than at room temperature.
  • Food safety: Use a whey protein powder intended for consumption without cooking, and follow its storage instructions.