Neither Frito pie nor chili mac are dishes that need improving—but why not at least try? Mashing up these two beloved staples of the chili sauce genre is just twisted enough to work. (Next thing you know, I’ll be stuffing this in enchiladas . . . Just kidding. Kind of.) Even better when their holy union is in the form of an ultra comforting casserole. The Fritos, instead of topping meaty chili sauce, as is traditional, act as the crunchy top layer to a lasagna pan full of mac and cheese drenched with spicy chili. The chips fuse with grated cheddar when baked, giving the whole thing a great texture. And then individual servings are garnished like Frito pie, with finely diced onion, sour cream, chopped cilantro, and, wouldn’t…