Very welcome cinnam0n! I also made this for Christmas supper.
Alternatives to powders if you prefer:
If you like it oniony, add a handful of chopped chives; they add a bit of colour and texture along with an onion flavour.
If you like it garlicky you can drop a few cloves of garlic into the pot with your potatoes while they cook. When potatoes are done, remove garlic cloves, peel (peel slips right off when cooked), and mash with potatoes. Easy peasy!