In a medium-size mixing bowl measure in oats, flour, baking powder, sugar, salt, pumpkin pie spice, and nuts. Mix well with a wooden spoon.
Mix in melted or softened coconut oil, maple syrup (or molasses), and vanilla extract until there are no dry pieces left.
With your fingers or a spoon press half of the mixture into the bottom of the iron skillet or baking dish. Set the rest of the streusel to the side while you make the pumpkin filling.
Pumpkin filling
In a medium bowl measure in 1 can of pumpkin.
Whisk in the corn starch and spices.
Open up a can of full-fat coconut milk and mix it a little to break up the coconut cream at the top of the can. Whisk in ¾ cup of the coconut milk then the sugar and vanilla.
Pour this mixture over the streusel you pressed in the bottom of the pan.
Top with remianing streusel.
Bake at 375 for 35-45 minutes.
Serve warm with vanilla ice cream or whipped topping!