DS is a pretty much white only eater, and doesn't eat 'mixed things' (so sandwiches, quiches etc are a no no). Things that work for us:

Cheese jaffle (though it gets pulled apart)
Flat bread/mountain bread
Cruskits
Corn cakes
Plain pasta
Polenta (I make a big batch with a big chunk of puréed cauliflower and freeze it in portions)
Crumpets (with whatever topping, though DS will only ever have butter and honey)
Savoury pike lets. Try adding grated cheese, cauli or peeled zucchini (puréed if you need to). These freeze well.
Pizza pinwheels
Salmon 'dip' - cream cheese and tinned salmon mixed together. Lasts a couple of days in the fridge.

It's not savoury, but DS loves his honey/banana wholemeal muffins. I had to hide the banana at first (ie 'look over there!' and wham, in goes the banana while he's not looking) but now DS 'knows' that you can't make muffins without fruit, or they don't work! Same with pikelets. I can post the recipe if you like - really easy, whole meal flour, no sugar and you can replace the banana with puréed apple or pear (or a mix). They freeze really well and DS usually eats them straight from the freezer

Nice to hear there are so many other 'white eaters' out there...