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Easy no-bake Monster Cookie Protein Bars made with natural peanut butter, vanilla whey protein powder, oat flour, maple syrup, and mini M&M’s for a sweet and protein-packed snack.

  • Total Time: 1 hour 10 minutes (including chilling)
  • Yield: 6-8 bars 1x

Ingredients

Scale
  • 1 cup creamy natural peanut butter (*must be natural, the kind with oil separating out)
  • 5 tablespoons maple syrup
  • 1 teaspoon vanilla extract
  • ½ cup oat flour (**see notes)
  • 60 grams vanilla whey protein powder (about ½ cup + 2 tablespoons)
  • 1 tablespoon mini chocolate chips
  • ¼ cup mini M&M’s

Instructions

  1. In a large bowl, combine the peanut butter, maple syrup, vanilla extract, oat flour, and protein powder.
  2. Stir everything together using an electric mixer or a silicone spatula until fully combined and smooth.
  3. Fold in the mini chocolate chips and mini M&M’s until evenly distributed throughout the dough.
  4. Line a loaf pan or meal prep container with parchment paper.
  5. Press the dough firmly into the container’s edges to create an even, thick layer. Optionally, sprinkle extra mini M&M’s on top for decoration.
  6. Cover the container with plastic wrap and freeze for 1 hour, or until the bars are firm.
  7. Carefully lift the bars out using the parchment paper and cut into 6 to 8 bars depending on your preferred size.
  8. Wrap each bar individually and store them in the fridge for up to 1 week or freeze for up to 2 months.

Notes

*Nut butter: Use natural peanut butter where the oil separates naturally. Avoid commercial brands like Kraft or Jif as they are too thick and won’t set properly., **Oat flour: If you don’t have oat flour, make your own by pulsing quick or old-fashioned oats in a blender until fine. Use gluten-free oats to keep this recipe gluten-free., These bars freeze well and can be eaten directly frozen or thawed to a chewy texture., Protein powder density varies; use a kitchen scale to measure 60 grams for accuracy.

  • Author: Laura
  • Prep Time: 10 minutes
  • Cook Time: 0 minutes
  • Category: Snack
  • Cuisine: American

Nutrition

  • Serving Size: 1 bar
  • Calories: 330 kcal
  • Fat: 20 g
  • Carbohydrates: 27 g
  • Protein: 15 g