Sounds similar to the Chile Relleno casserole that we make.
It takes the work out of making the traditional Rellenos, although I do make those, from time to time.
In CA, I don't think I'd ever seen anything besides cheese stuffed into a chili called a chili relleno, but I did read somewhere that in TX, as you may be, the stuffing can have quite a variety of things. So yeah, this recipe may have roots in TX. Where I am (CO), if I'm not careful a "chili relleno" is a tortilla stuffed with cheese & chopped chilis, baked. No thank you!