Add your kosher salt and white pepper now. Taste as you go—I typically add the salt, stir, taste, then adjust. White pepper is milder and less assertive than black pepper, which is why I prefer it here, but use what you have on hand.
Add your minced garlic and the whisper of nutmeg. These two ingredients elevate everything without announcing themselves. You should taste the potato, enriched and savory, but not identify the spices individually.
Gluten-free note: All of these seasonings are naturally gluten-free, so you're in the clear here.