You microwave a sweet potato quickly by scrubbing the skin clean, drying it thoroughly, and puncturing holes all over the surface using a fork. Microwave the prepared potato on high for about five to seven minutes, flipping it midway through to ensure even cooking throughout. Check for tenderness by inserting a fork into the thickest part of the potato to see if it glides in easily. Let the hot potato rest for a few minutes before slicing open and adding your favorite toppings.