Preheat the oven to 350°F/176°C.
In a large bowl, mix the flour, sea salt, spices, and soda. Mix in the leftover oatmeal and pumpkin puree until the flour mixture completely coats the oats and pumpkin. It will look a bit crumbly.
In a liquid measurer, add the maple syrup, sugar, eggs, and vanilla. Add the oil if using and mix well.
Melt the butter or coconut oil, if you're not using oil. Make a well in the flour mixture and pour in the melted fat. Mix until just incorporated.
Similarly, if you're using oil, make a well in the flour mixture and add the maple-oil mixture. Mix until just incorporated. Over mixing may flatten the finished cookies, making them more dense.
Add the chocolate chips, dried fruit, and zest according to taste. Mix.
Cover a baking sheet with parchment paper (or grease it) and place 2-3 Tablespoons of cookie dough 2-3 inches apart. You may also use a small ice cream or melon scoop to dose the batter but it will stick a bit.
Bake for 12-15 minutes, or until the cookies firm up and becomes slightly brown. Browning is hard to observe when the dough has wheat flour, maple syrup, and coconut sugar! Look for the tops of the cookies to lose the their glossy shine and to even crack just a little.