My changes are:
-Used only 1 tsp chili powder (it's not my favorite flavor and I felt like 2T was tons. It was perfect.
-used flour tortillas and just left them whole.
-halfed the entire recipe and only used 4 tortillas. Fit perfectly in an 8x8.
-used the juice of an entire lime (we love lime)
-left out the oil and butter a non stick skillet worked great and after draining the ground beef there was a little bit of grease residue to be nonstick.
Tex mex casserole