In a large bowl, stir together the peanut or cashew butter, honey, vanilla extract, and sea salt until fully combined. The mixture will be smooth and aromatic, making your kitchen smell amazing.
Fold in the oats, mini chocolate chips, and pepitas. The mixture may look dry at first, but keep stirring until everything is evenly incorporated.
Line your baking pan with parchment paper. Scoop the mixture into the pan and cover with another sheet of parchment. Press the mixture firmly into the pan, using the back of a measuring cup to smooth the top.
Refrigerate the bars for at least one hour. This step is crucial to make the bars firm and chewy. Once chilled, slice them into 8 bars and enjoy.