The Oatman House. I had the Oatman Club Sandwich with a little cup of homemade potato soup. It was really good! The restaurant is in an old house with indoor and outdoor seating, plus you can rent it out for events.
Here's some info on the restaurant: Dr. Charles Oatman, a former drummer boy in the Civil War, had this house built for his family in 1875. A classic example of Gothic Revival Architecture, this house with its "gingerbread" trim now stands as an historic landmark in downtown Collinsville. With an emphasis on preserving the Victorian decor inside, the Oatman Haus offers visitors the opportunity to step back in time to enjoy the quaint atmosphere of an era gone by.