Do not preheat the oven, put place the tray in a cold oven and let it gradually heat up with the biscuits inside.
Set the oven temperature at 350 F,i.e., 176 C, and heat up for ten minutes after the oven has warmed up.
In the microwave
Wrap each Pillsbury biscuit in a piece of parchment paper or a small kitchen towel.
Set the timer to 15 seconds, take out one Pillsbury biscuit, unwrap it, and check its condition. Keep reheating in five-second intervals with each new cycle and check the same biscuit after each cycle.
On the stove
Put small pieces of butter in the middle of each Pillsbury biscuit and wrap them in individual pieces of aluminum foil. Put the Pillsbury biscuits on the skillet while it is cold and turn on the plate at medium temperature.
Cook the biscuits until you notice that the butter has melted, which you will see if you unwrap one biscuit.
When they are done, remove the Pillsbury biscuits from the skillet, unwrap them and place them on a plate. Cover them with a kitchen towel and leave them to sit like that for about five minutes.