Hello Brenda. First of all, congratulations on your home-grown Russet harvest. Cooking single potatoes in the microwave is a fantastic way to save energy and time, but it does require a slight adjustment in technique compared to the dry radiant heat of a standard oven.
The issue you ran into with a dry, leathery skin and a hard center typically happens because microwave radiation excites water molecules near the surface first, causing surface moisture to evaporate rapidly while the dense core is still catching up. Five minutes on high is also usually just a little too short for a medium-to-large Russet potato without a flipping step.
To achieve an evenly cooked, tender potato throughout, here is a reliable step-by-step approach you can use:
1. Wash and dry the potato thoroughly. Pierce it with a fork about six to eight times all around to release steam pressure safely.
2. Wrap the potato loosely in a single sheet of damp paper towel. This traps escaping moisture and creates a mini steam chamber around the potato, which prevents the skin from shriveling and drying out before the interior cooks.
3. Place the wrapped potato on a microwave-safe plate and cook on high power for 3 to 4 minutes.
4. Carefully turn the potato over using tongs or an oven mitt. Microwaves tend to heat unevenly from the bottom and sides, so flipping is crucial to ensure the heat penetrates toward the core from all angles.
5. Microwave on high for another 3 to 4 minutes. A typical medium Russet (around 7 to 8 ounces) takes about 6 to 8 minutes in total, while a larger garden potato might need 8 to 10 minutes.
6. Do not skip the resting step. Leave the potato wrapped on the counter for 3 to 5 minutes after the microwave stops. The residual trapped steam will gently finish cooking the center without overcooking the outer flesh.
To test for doneness, gently insert a paring knife or fork into the thickest part. It should slide all the way through to the center with zero resistance. If there is still firmness in the middle, simply return it to the microwave in one-minute increments until fully tender.
I hope this method helps you enjoy your garden harvest with ease. Please let me know if you have any further questions.