Add sweet potatoes to instant pot. Then add broth.
Hit manual button on instant pot and set for 10 minutes. Close lid. Make sure valve is set to seal position. (will take almost 10 minutes to come to pressure)
When timer is done turn valve to quick release. (Watch out for hot steam)
Open pressure cooker and mash the potatoes.
Add butter and stir.
Add cinnamon, nutmeg and salt. Continue to mash until creamy.