In a large mixing bowl, combine the rolled oats and the protein powder. Whisk thoroughly to ensure the powder is evenly distributed and not clumped.
Incorporate the hemp hearts, pumpkin seeds, sliced almonds, chia seeds, flaxseed meal, and sunflower seeds into the oat mixture.
Fold in the dried cranberries until evenly dispersed.
Transfer the dry mixture into a food-grade airtight container or vacuum-seal in portions for long-term storage.
Store in a cool, dry, dark location to preserve the integrity of the fats in the seeds and nuts.
To serve, combine 1/2 cup of muesli with 1/2 cup of liquid (water, milk, or nut milk). Let sit for 10 minutes or soak overnight in the refrigerator.