Preheat oven to 375F and grease a 10 or 12 inch cast iron skillet, alternatively a 9x13 glass dish.
In a medium bowl, mix together oats, whole wheat flour, coconut sugar, baking powder, pumpkin pie spice, and salt. Mix in melted coconut oil until crumbly and well combined.
Pour half of the crisp mixture in the bottom of the skillet and press down.
In a large bowl, mix together all pumpkin mixture ingredients.
Pour all of pumpkin mixture on top of crisp mixture in pan, then top with remaining crisp mixture.
Bake for 40-45 minutes or until it looks like it has firmed up. After taking out of oven, let stand 15 minutes to rest.
Serve with ice cream or whipped cream.