To make this bark, start by adding the almond flour, collagen powder (or protein powder), maple syrup, melted coconut oil, and vanilla extract to a large bowl. Mix everything together until fully combined.
The mixture will look crumbly at first — that's totally normal! Keep mixing, and it will come together into a dough. Fold in ¾ cup of the chocolate chips and mix to combine.
Next, divide the dough in half. Transfer one half to a separate bowl and add the cocoa powder to it. Mix well until the cocoa powder is fully incorporated and the dough turns into a rich brownie batter.
Line a baking sheet with parchment paper. Add dollops of both the cookie dough and the brownie batter onto the parchment and press them down into one flat, even layer, swirling the two together as you go for that classic brookie look.
Finally, melt the remaining chocolate chips. Add them to a small, microwave-safe bowl and microwave in 30-second increments, stirring between each one, until fully melted and smooth — this usually takes 2–3 rounds. Pour the melted chocolate over the top of the bark and spread it into an even layer.
Sprinkle generously with flaky salt, then transfer the baking sheet to the freezer. Allow the bark to freeze for at least one hour, or until fully set.
Once it's done, break it into pieces and enjoy! Store any leftovers in an airtight container in the freezer for up to two weeks.