Step 1

Line a 9x5 inch loaf pan with waxed paper or parchment paper.

Step 2

In a medium saucepan over medium heat, bring the heavy cream, sweeteners, and coconut oil to a low boil. Reduce the heat and simmer 20 to 30 minutes, or until the mixture is thickened and reduced by about one third.

Step 3

Remove from heat and add the chopped chocolate. Let stand 5 minutes, until melted, then whisk until well combined and smooth.

Step 4

Whisk in the collagen, if using, the cocoa powder, vanilla extract, and salt until smooth.

Step 5

Spread the mixture in prepared pan. Sprinkle with sea salt or chopped nuts, if desired. Chill 6 hours until firm and cut into squares.