1-2tbspwhole milkif needed to turn cake mix into a crumble
Spray inside of pressure cooker pot (better yet use a non stick pot, link in this post) Melt butter and set aside. Pour drained peach slices into pressure cooker pot and sprinkle sugar over them.
Whisk cornstarch and water in a bowl until smooth, pour this over the peaches too.
In a bowl combine cake mix with cinnamon, and then drizzle in melted butter. Use a fork to combine them so dry mix becomes more of a crumble. Add 1 tbsp milk in and use fork to combine well to create damp crumble (like coffee cake topping). Use 2nd tbsp if necessary.
Sprinkle this crumble over your peaches until they are covered and crumble is evenly distributed across fruit. Close lid and steam valve and set to high pressure for 10 minutes.
Do a quick release and spoon into bowls topped with ice cream or whipped cream.