In a large mixing bowl, combine the rolled oats, chia seeds, cocoa powder, and salt.

In a small saucepan over low heat, melt the peanut butter and honey together until smooth. Remove from heat and stir in vanilla extract.

Pour the wet mixture over the dry ingredients and mix until fully combined.

Fold in the dark chocolate chips.

Press the mixture firmly into a parchment-lined 8×8 inch pan. Use the back of a spoon or a flat spatula to even it out.

Sprinkle additional chocolate chips on top and lightly press them in.

Chill in the refrigerator for at least 1 hour, then cut into bars.