Preheat oven to 350 and line two baking sheets with parchment paper.
In a large bowl, mix together the sunflower seeds, rolled oats, flax seeds, hemp seeds, pumpkin seeds, chia seeds, sesame seeds, psyllium husks, onion powder, sea salt, rosemary, and smoked salt.
Add in the water, coconut oil, maple syrup stir until everything is well combined. Let the dough sit for 10-20 minutes, until thickened. Time the dough, letting it sit longer will make it too thick to spread onto the baking sheets.
Divide the dough between the two sheet pans. Use the bottom of a wet spatula to spread the crackers out into a thin layer. Keep dipping the spatula in water as needed to prevent sticking. Score the dough into squares or rectangles.
Bake for 30 minutes on one side. Remove from oven and break along the scored lines into crackers. Flip the crackers over and bake for another 30-45 minutes until the crackers are golden brown.
Let cool and serve. Store in an airtight container in the freezer for up to 4 weeks.