I think that you are likely dealing with a little bit of 2 things here. I agree that you may want to look clearly at what you are feeding here. A waffle will usually be made of poor quality flour, not have much in the way of fiber which makes a person feel full. I'm sure you feed her other things though and that was just an example. But we could all use a little more variety and better quality food in our diets.
Aside from that, she's so young. She has discovered this new thing she really likes. It's fun, it feels good, she likes the chewing and the tastes.
There is a lot of evidence that grazing is ok and even a good way to eat. But to really graze healthy a person would need to eat like an ounce of cheese and a couple of high fiber crackers and that's it. Then a while later, a couple slices of fruit, but really only bites not a whole piece, something else like maybe some celery with peanut butter. But I know most won't give that to a child her age so I'm just giving an example of the variety you could try and give.
There are a lot of great variety in yogurt these days, even soy types etc. My 8 year old discovered soups and salads around 8 months and she became a big eater of almost anything. She liked lima beans, spinach, even raw lettuces which I totally dislike.
I've always bought the highest quality wheat breads with many grains and because we have so many kids in the house it's easy for me to slice up a sandwich for several kids. It might be harder to limit the portions with one little one. But I'm sure you are doing ok :)
Suzi