Original recipe from a family friend's cookbook. Sadly, I don't know the name.
Cooling the bean and sour cream mixture for precisely ten minutes prevents the egg from curdling when incorporated into the warm skillet contents. Vegetables must saute for six minutes over medium-high heat to drive off excess moisture, ensuring the filling remains cohesive rather than watery inside the baking dish. Undercooking the whole wheat lasagna noodles slightly past al dente is the single technique that determines success or failure here, as the pasta continues to absorb moisture from the salsa and bean layers during the thirty-minute covered bake at 375 degrees.
Removing the foil for the final fifteen minutes allows surface evaporation to concentrate flavors while lightly browning the reduced-fat Monterey Jack cheese. Allowing the assembled dish to rest for five minutes off the heat solidifies the internal structure for clean slicing. Substituting corn tortillas for the wheat noodles requires reducing the initial oven temperature by 25 degrees to prevent the edges from burning before the center reaches serving temperature.