In a large mixing bowl, stir together the peanut butter, coconut oil, honey, and vanilla extract until smooth. If the peanut butter is very thick, warm it slightly to help it mix.
Add in the protein powder, blended oats, ground flaxseed, and shredded coconut. Mix until a thick, even dough forms. If the mixture is too dry, add a splash of almond milk or warm water to help it come together.
Line a square baking dish or loaf pan with parchment paper. Press the dough firmly into the pan in an even layer, smoothing the top.
In a small microwave-safe bowl, combine the chocolate chips and coconut oil. Microwave in 20-second intervals, stirring in between, until fully melted and smooth.
Pour or drizzle the melted chocolate over the bars. Sprinkle sea salt over the top.
Chill in the refrigerator or freezer for 30 minutes, or until firm.
Slice into bars and store in an airtight container in the fridge for up to 1 week, or freeze for longer storage.