Preheat the oven to 300°F. Line a large baking sheet with parchment paper.
Mix all dry ingredients in a bowl. Add boiling water and oil and mix all ingredients together. Set aside for 5 or so minutes to let the dough absorb the liquid. After sitting and the water has been absorbed, stir the dough again for a few strokes to fully combine all ingredients and evenly distribute the seeds.
Place the dough on a large baking sheet lined with parchment paper. Add another paper on top of the dough and use a rolling pin to flatten it evenly into a rectangle shape. Press or roll the dough as thin as possible and to all the outer edges of the baking sheet.
Remove the upper parchment paper. Place the baking sheet on the middle/lower rack of your oven for about 40-45 minutes. Seeds tend to be heat sensitive so check occasionally for browning.
Turn off the oven and leave the crackers to dry in the oven until the oven is fully cool, up to 2 hours
Once the seed crackers are dried and completely cool, break into pieces and enjoy.
Notes
Storage: Store leftover crackers in an airtight container at room temperature for 1-2 days. Seed crackers must be fully cooled and fully dried before storage.Leftover tip: If your leftover crackers have become slightly limp or soft, simply place them on a lined baking sheet and into a 300* oven for 5 or so minutes to redry them. I start with 5 minutes, but up to 10 minutes back in the oven will crisp up the crackers again.