Preheat oven to 350 degrees F and line an 8x8 baking pan with parchment paper.
In a large bowl, stir together for almonds, sunflower seeds, coconut flakes, and pumpkin seeds.
In small saucepan, stir together your choice of nut butter, coconut oil, collagen, and erythritol, and heat for 2-3 minutes over low heat until everything is smooth and combined.
Remove from heat and stir in vanilla extract, cinnamon, and sea salt.
Pour over the nut and seed mixture and stir.
Add egg whites and stir together well until all the dry ingredients are coated well with wet ingredients.
Transfer to the prepared baking pan and use a spatula to press down firmly into a flat, even layer.
Bake for 20 minutes until the edges are lightly browned.
Let it cool completely. Use the parchment paper to remove from the pan, and use a sharp knife to slice into 12 even bars.