Prepare the pan: Line an 8x8 inch baking pan with parchment paper. This will make removing the bars easier.
Mix wet ingredients: In a large bowl, stir together peanut butter, honey, vanilla extract, and sea salt until the mixture is smooth and uniform.
Add dry ingredients: Pour the oats, mini chocolate chips, and pepitas into the wet mix. At first, it may seem crumbly, but continue stirring.
Combine thoroughly: Keep mixing until everything sticks together well.
Press mixture into pan: Transfer the mixture to the lined baking pan. Use a second piece of parchment paper and the back of a measuring cup to press and flatten the mixture firmly and evenly.
Chill: Refrigerate the mixture for at least 1 hour to allow it to set firmly.
Slice and serve: Once chilled, slice into 8 bars. Store leftovers in the fridge for freshness.