Kinda looks like sweet potatoes.

In case it isn’t:

Olive Oil, Fresh Rosemary, Salt & Pepper.

Throw some roughly cut Carrots, Celery Root and an Onion in there as well.

About 30 minutes at 180 - 200 degrees celsius (dependent on oven). Bam! Good eats for you and yours.

If it is sweet potatoes, I can’t help as I’ve only tried them once and didn’t care for them.