Line a 8x4 inch loaf pan with parchment paper.
In a medium bowl, mix together the peanut butter, coconut oil, maple syrup, vanilla and salt until smooth.
Fold in 1/4 cup chocolate chips.
Pour the fudge into the pan. Freeze for 5-10 minutes, then sprinkle 2 tablespoons of chocolate chips on top of the fudge and press them in a bit if necessary.
Freeze until firm for about 30 minutes. Sprinkle with a little sea salt. Cut into 10-12 squares.
Store fudge in a freezer safe container in the freezer for up to 3 months.