Casa Grande is a no-thrills Mexican restaurant, which excels in quick service. They have a very basic Tex-Mex menu, the portions are not too big, and the prices are very acceptable. The food is very decent, and actually pretty good for rural Indiana! I tend to have the Chimichanga DeLux, which includes one chicken and one ground beef chimichanga, while my wife is a big fan of the Shrimp Fajitas. The complimentary chips and salsa are pretty decent too as is the sweet Sopapilla.
Casa Grande is a cheap and quick Mexican restaurant, offering decent food at very acceptable prices, which makes it one of the few decent options in Greencastle.