Line an 8x8 inch square baking pan with parchment paper, leaving an overhang on two sides.

In a small saucepan over low heat, combine peanut butter and honey, stirring until smooth and fully combined.

Remove from heat and stir in vanilla extract and salt.

In a large mixing bowl, combine oats, ground flaxseed, and chocolate chips.

Pour the liquid mixture over the dry ingredients and stir until the oats are thoroughly coated.

Transfer the mixture to the prepared pan and press down firmly using a spatula or the bottom of a measuring cup to ensure the bars are compact.

Refrigerate for at least 2 hours or until completely firm.

Lift the bars out of the pan using the parchment paper and slice into 12 rectangular bars.