Prepare an 8 x 8 pan by lining it with waxed paper.
In the bowl of a mixer, blend the nut butter, collagen, acacia fiber, and sweeteners. Mixture will be slightly crumbly. If it seems super wet still, then likely your nut or seed butter had more oil than mine, so just add a couple more tablespoons of collagen, acacia, or coconut flour to dry it out!
Press into the pan, folding extra waxed paper over the top and pressing down evenly into the pan.
On the stove top over low heat, gently melt the chocolate and coconut oil. You can also do this in the microwave, just be careful to not heat the chocolate too hot, or it will clump (seize) on you.
Spread the melted mixture evenly over the bars, and place in the fridge or freezer to firm up the chocolate.