Chili & pasta are my favorite starchy dinners for omni guests.
For cornbread, we've had great luck with packaged mixes (like
Bob's Red Mill). Almost all are oil-free and I just add applesauce and a bit of water (to replace any oil/eggs/dairy). You can also add some fresh/frozen corn for added texture.
I enjoy having both corn chips and cornbread with chili, but if I had to pick, chips are more filling and have great texture (and taste). We slice tortillas into 1/8ths and bake for about 12 minutes at around 425. (Oops, I just noticed that the chips will go with salsa ~ sounds delicious!)
Fruit has always been a big hit for snacking, as are veggies and hummus. I've yet to personally make any hummus that's any good, but Whole Foods has a great low-fat one that's just beans, lemon powder, salt, and garlic.