
Preheat the oven to 275℉. Lightly spray an 8"x8" square pan with coconut oil spray. (or grease with butter)
In a large bowl, whisk together the flour, oatmeal, ground ginger, nutmeg, pumpkin spice blend, and baking powder. Set aside.
In a large heavy saucepan, melt the butter, light corn syrup, brown sugar, and molasses over a low heat. DO NOT BOIL.
Slowly stir the melted butter mixture into the dry ingredients, mixing until all the ingredients ae well blended and it's a bit crumbly. Then beat in the egg, one at a time. If the cake looks dry, beat in 1 Tablespoon of milk at a time until you have a soft batter.
Pour the batter into the pan and bake for 90 minutes, until firm and set and it turns a dark golden brown. Remove from oven and cool in the pan on a baking rack for at least 30 minutes before removing cake to another baking rack.
Once it's completely cool, slice and serve. Or store in an airtight tin for up to 3 days. (5 days if refrigerated). Serve with confectioner's sugar sprinkled on top.