Once the water starts to simmer add lemon juice and apples to it. Add in the cinnamon powder .
Cover loosely and let it cook until softened - for 15-20 minutes on low-medium flame.
Stir occasionally in between.
Add more water if required.
Let it cool down and blend it until a smooth puree.
Notes
If you do not have cinnamon , skip it. If you have whole cinnamon spice, add it since the beginning and discard it before blending the apples. Lemon juice is used to prevent apples from turning black. Applesauce is pretty thick so add more water only if its needed.For simple Instant Pot Apple sauce recipe here.Recipe for the brownies is given below.