Heat a skillet over medium-high heat. Add the macadamia nuts and toast for about 5-7 minutes, until they are lightly golden-brown and fragrant, stirring constantly so they don't burn. Remove from pan.
Place the macadamia nuts in a jar along with the dates. Add 2 cups of water to the jar. Let it soak for 24 hours.
Strain the macadamia nuts and dates and discard the water, and add to a blender. Add the vanilla and 2 cups of fresh water to the blender. Blend on high for 5 minutes, or until it is creamy. It should be smooth and creamy, and there is no need to strain it.
Add your desired amount of cold brew coffee to a blender along with 1-4 tablespoons of the macadamia cream, and collagen, if desired. Blend until it is frothy. Pour into a glass or over ice. Enjoy!