Melt the butter in a the cooker. Add the onion and both bell peppers. Cook, stirring occasionally, until softened, about 4 minutes. Add the ham, garlic, sage, thyme, celery seeds (if using), salt, and pepper. Cook, stirring often, until fragrant, about 1 minute.
Turn off the SAUTE function. Stir in the potatoes and broth, scraping up any browned bits on the pot’s bottom. Lock the lid onto the cooker.
Optional 1Max Pressure Cooker Press Pressure cook on Max pressure for 10 minutes with the Keep Warm setting off.
Optional 2All Pressure Cookers Press Pressure cook (Manual) on High pressure for 12 minutes with the Keep Warm setting off.
Use the quick-release method to bring the pot’s pressure back to normal. Unlatch the lid and open the cooker. Stir well.
Press Saute, set time for 10 minutes.
Bring the mixture to a simmer, stirring often. Continue without stirring until the liquid boils off and the hash touching the hot surface starts to brown, 3 to 4 minutes. Turn off the SAUTE function and remove the hot insert from the machine to stop the cooking. Some of the potatoes may have fused to the surface. Use a metal spatula to get them up. The point is to have some browned bits and some softer bits throughout the hash.