8. Mashed Potatoes
While potato sizes vary greatly, make grocery shopping easier by planning for one large Yukon gold potato per guest. This should come out to about ¾ cup of mashed potatoes per person.
9. Vegetable Sides
With everything else going on at the table, each guest will probably eat about four ounces of vegetables total. Keep in mind that salad will be a different story so each guest will likely only eat about one ounce of greens.