You can purchase a can of pumpkin puree for this recipe. Or consider making your own pumpkin puree in your Instant Pot.
If you don’t have Pumpkin Pie spice on hand, a simple substitution if to use 1/2 tsp cinnamon + 1/2 tsp cloves.
Make up a homemade buttery crust for the dessert bars and bake. Then create the flavorful filling with real pumpkin puree. Pour it over the baked crust.