Pour water into the bottom of a pressure cooker fitted with the steamer insert. Place potatoes in the steamer.
Set the pressure cooker to 5 minutes under high pressure.
Let the pressure natural release for 10 minutes.
Heat butter and oil together in a skillet. Once the butter melts, carefully add the potatoes to the pan. Stir to coat.
Sprinkle chives and dill over the top and toss to coat. Season to taste with salt and pepper. Continue cooking until potatoes are browned, about 5 minutes. Serve immediately.