In a large mixing bowl, add the rolled oats, cocoa powder, and salt. Whisk together until evenly mixed.

In a small saucepan over low heat, melt the peanut butter and honey or maple syrup for about 3-5 minutes, stirring frequently.

Pour the warm peanut butter mixture into the dry ingredients and fold together until well combined.

Press the mixture firmly into a lined baking dish for an even layer and compact texture.

Refrigerate the bars for at least 30 minutes to set.

After setting, cut the bars into squares or rectangles and serve.