Preheat your oven to 325°F (165°C) and line a baking sheet with parchment paper to prevent sticking.
Mix the seeds and seasonings in a large mixing bowl. Add the ground flaxseeds, sunflower seeds, pumpkin seeds, sesame seeds, chia seeds, nutritional yeast, and any optional herbs or spices you use. Mix well until everything is evenly combined.
Add the water to the seeds and mix in the mixing bowl until everything is just covered. Let them sit for about 20 minutes or until the seeds have absorbed the water and bind together.
Spread the mixture onto the lined baking sheet. Use a spatula or the back of a spoon to spread the mixture as thinly and evenly as possible*. You can also use another piece of parchment paper on top and roll the ball flat with a rolling pin. The thinner the layer, the crispier your crackers will be.
Bake for 35-45 minutes, or until the crackers are firm and the edges start to become golden. The baking time may vary depending on the thickness of your crackers and how brown/golden you prefer them. Keep an eye on them to avoid burning.
Score the crackers (optional) at the 15-minute baking mark. You can use a knife or a pizza cutter to score the mixture into squares or rectangles. This makes it easier to break the crackers into uniform shapes after baking. Return the baking sheet to the oven.
Cool and break. Allow the crackers to cool completely on the baking sheet. If you scored the crackers before baking, you could now easily break them along those lines. If not, break them into pieces.
Enjoy! These homemade seed crackers are a healthy and delicious snack.