Line a large sheet pan with parchment paper and preheat an oven to 350°F.

Combine the oat flour, pumpkin pie spice and salt to a medium bowl and whisk really well.

In a small bowl, combine the pumpkin (level off with finger when measuring), syrup, almond butter and extract and whisk really well until completely smooth. Pour over the dry ingredients and stir until mixed. Add the chocolate chips. Stir for at least a couple of minutes until it thickens up well. The batter will seem too wet at first but the nature of oat flour is that it thickens as you stir.

Place the dough in the fridge to chill for 30 minutes.

For the cookie cakes, separate the dough in half and place on the prepared lined pan several inches apart. Place another piece of parchment paper on top and roll out each dough into a round cookie shape about 7 inches wide and a 1/4 inch thick. Don't roll them out too thin, or they will be too fragile. Measure if necessary for accurate results. I pressed a few extra chocolate chips on the tops for appearance purposes.

Bake them for 9-10 minutes. They will still look a bit undercooked, which is fine, they will finish cooking as they cool. You don't want to overbake them or they can dry out. Leave them to cool an hour before moving, as they will be delicate. Once they are completely cool, very carefully (I used a large spatula) flip the cookies over onto a plate (that will fit into your freezer). Remove your ice cream to soften some for a few minutes before assembling the cookie sandwich. Spread out your softened ice cream on the cookie, leaving about 1/2 inch gap on the edges. I used the back of my spoon to spread the ice cream around. Was a pain to do, but was worth it in the end. Carefully place the top cookie on and place in the freezer to completely firm up before slicing. It is best to leave it in there at least a couple of hours or so, so that it is totally solid before slicing. After slicing, keep them in a covered container or large plastic bag until ready to serve. These cookies stay soft while in the freezer!