Preheat the oven to 350F and line a standard muffin tin with 12 parchment muffin cups.
In a high speed blender (or food processor), add the oats, seeds, nuts, baking soda, spices, and salt. Blend until a fine coarse meal forms, scraping down the sides and under the blade as needed.
Add the pumpkin, maple syrup, molasses, oil, eggs, and vanilla. Blend on low/medium until combined, scraping down the sides and under the blade to ensure everything is incorporated.
Pour into the prepared muffin tin, filling each muffin just below the brim. Top each muffin with chocolate chips and/or chopped walnuts, if using.
Bake for 30-35 minutes, or until cooked through and darkened/firm on top.
Let cool for a few minutes before eating. Let cool completely on a cooling rack before storing.
These are best eaten room temp or just warm. They’re delicious on their own or cut in half and topped with butter.