Combine dry ingredients: In a mixing bowl, combine rolled oats, cocoa powder, chia seeds, and protein powder. Whisk until mixed thoroughly.

Mix wet ingredients: In another bowl, blend natural peanut butter and honey or maple syrup until smooth.

Incorporate mixtures: Gradually fold the dry mixture into the wet mixture until fully combined.

Chill the mixture: Cover the bowl and refrigerate for at least 30 minutes until firm.

Shape brownie bites: Scoop portions using a cookie scoop, roll into balls, and place on a parchment-lined tray.

Store for later: Transfer to an airtight container and refrigerate or freeze for longer storage.