Preheat oven to 325 degrees, or 300 convect.
Have two sheet pans ready, lined with silicone mats or parchment paper (optional).
In a large bowl, stir together the first five ingredients – oats, coconut, pumpkin seeds, nuts, and salt
In a smaller bowl, stir together the pumpkin puree, oil, maple or date syrup, honey, vanilla extract along with the cinnamon, ginger, allspice, cloves, nutmeg, and cardamom, if using. After blending it all together give it a taste and see if you like the pumpkin flavor. If all is to your liking, add this mixture to the larger bowl and combine well.
Spread in an even layer on the two sheet pans. Bake for approximately 30 minutes, stirring every 10 minutes or so. Note the color before you place the pans in the oven – it’s done when it has noticeably darkened. It will be soft when you first take it out. Let it cool on the sheet pans. It will harden and form clusters as it does. Store in a glass jar, cereal holder, or sealable plastic bag.