In a medium bowl, combine rolled oats, honey, natural peanut butter, and vanilla extract. Stir together until sticky.

Spray a standard muffin tin with nonstick cooking spray.

Divide the oat mixture among the muffin cups and press down firmly.

In a microwave-safe bowl, combine chocolate chips and coconut oil. Microwave until melted.

Spoon the melted chocolate over each cup, spreading it evenly.

Optionally, sprinkle sea salt over each cup while chocolate is warm.

Transfer to the freezer for at least 1 hour to set.

Gently twist the muffin tin to release the cups and store in an airtight container.